* [linux-next:master 6903/8646] net/ipv4/tcp_input.c:5010:2: warning: Value stored to 'reason' is never read [clang-analyzer-deadcode.DeadStores]
@ 2022-02-26 4:34 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2022-02-26 4:34 UTC (permalink / raw)
To: kbuild
[-- Attachment #1: Type: text/plain, Size: 24463 bytes --]
CC: llvm(a)lists.linux.dev
CC: kbuild-all(a)lists.01.org
BCC: lkp(a)intel.com
CC: Linux Memory Management List <linux-mm@kvack.org>
TO: Menglong Dong <imagedong@tencent.com>
CC: Mengen Sun <mengensun@tencent.com>
CC: Hao Peng <flyingpeng@tencent.com>
CC: Eric Dumazet <edumazet@google.com>
CC: David Ahern <dsahern@kernel.org>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: 44948bd49d878dad6c9707e34f4a06df73c3a800
commit: a7ec381049c0d1f03e342063d75f5c3b314d0ec2 [6903/8646] net: tcp: use tcp_drop_reason() for tcp_data_queue()
:::::: branch date: 26 hours ago
:::::: commit date: 6 days ago
config: x86_64-randconfig-c007 (https://download.01.org/0day-ci/archive/20220226/202202261220.JcaWXs0L-lkp(a)intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=a7ec381049c0d1f03e342063d75f5c3b314d0ec2
git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
git fetch --no-tags linux-next master
git checkout a7ec381049c0d1f03e342063d75f5c3b314d0ec2
# save the config file to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 clang-analyzer
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
clang-analyzer warnings: (new ones prefixed by >>)
^
fs/ocfs2/extent_map.c:491:7: note: Assuming the condition is false
if (i == (le16_to_cpu(el->l_next_free_rec) - 1)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/ocfs2/extent_map.c:491:3: note: Taking false branch
if (i == (le16_to_cpu(el->l_next_free_rec) - 1)) {
^
fs/ocfs2/extent_map.c:512:2: note: Returning without writing to '*hole_len'
return ret;
^
fs/ocfs2/extent_map.c:512:2: note: Returning zero (loaded from 'ret'), which participates in a condition later
return ret;
^~~~~~~~~~
fs/ocfs2/extent_map.c:899:9: note: Returning from 'ocfs2_get_clusters_nocache'
ret = ocfs2_get_clusters_nocache(inode, di_bh, cpos, &hole_size,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/ocfs2/extent_map.c:901:7: note: 'ret' is 0
if (ret) {
^~~
fs/ocfs2/extent_map.c:901:3: note: Taking false branch
if (ret) {
^
fs/ocfs2/extent_map.c:909:7: note: Assuming field 'e_blkno' is equal to 0
if (rec.e_blkno == 0ULL) {
^~~~~~~~~~~~~~~~~~~
fs/ocfs2/extent_map.c:909:3: note: Taking true branch
if (rec.e_blkno == 0ULL) {
^
fs/ocfs2/extent_map.c:910:9: note: Assigned value is garbage or undefined
clen = hole_size;
^ ~~~~~~~~~
Suppressed 5 warnings (5 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
5 warnings generated.
Suppressed 5 warnings (5 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
Suppressed 3 warnings (3 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
4 warnings generated.
Suppressed 4 warnings (4 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
5 warnings generated.
Suppressed 5 warnings (5 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
5 warnings generated.
Suppressed 5 warnings (5 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
6 warnings generated.
Suppressed 6 warnings (5 in non-user code, 1 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
5 warnings generated.
Suppressed 5 warnings (5 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
5 warnings generated.
Suppressed 5 warnings (5 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
5 warnings generated.
Suppressed 5 warnings (5 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
4 warnings generated.
Suppressed 4 warnings (4 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
4 warnings generated.
Suppressed 4 warnings (4 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
4 warnings generated.
Suppressed 4 warnings (4 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
5 warnings generated.
Suppressed 5 warnings (5 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
5 warnings generated.
Suppressed 5 warnings (5 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
14 warnings generated.
net/ipv4/tcp_input.c:3404:3: warning: Value stored to 'icsk' is never read [clang-analyzer-deadcode.DeadStores]
icsk = inet_csk(sk);
^ ~~~~~~~~~~~~
net/ipv4/tcp_input.c:3404:3: note: Value stored to 'icsk' is never read
icsk = inet_csk(sk);
^ ~~~~~~~~~~~~
>> net/ipv4/tcp_input.c:5010:2: warning: Value stored to 'reason' is never read [clang-analyzer-deadcode.DeadStores]
reason = SKB_DROP_REASON_NOT_SPECIFIED;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/ipv4/tcp_input.c:5010:2: note: Value stored to 'reason' is never read
reason = SKB_DROP_REASON_NOT_SPECIFIED;
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/ipv4/tcp_input.c:5334:11: warning: Access to field 'truesize' results in a dereference of a null pointer [clang-analyzer-core.NullDereference]
goal -= rb_to_skb(node)->truesize;
^
include/linux/skbuff.h:3663:23: note: expanded from macro 'rb_to_skb'
#define rb_to_skb(rb) rb_entry_safe(rb, struct sk_buff, rbnode)
^
include/linux/rbtree.h:78:2: note: expanded from macro 'rb_entry_safe'
({ typeof(ptr) ____ptr = (ptr); \
^
net/ipv4/tcp_input.c:5325:6: note: Left side of '||' is false
if (RB_EMPTY_ROOT(&tp->out_of_order_queue))
^
include/linux/rbtree.h:30:31: note: expanded from macro 'RB_EMPTY_ROOT'
#define RB_EMPTY_ROOT(root) (READ_ONCE((root)->rb_node) == NULL)
^
include/asm-generic/rwonce.h:49:2: note: expanded from macro 'READ_ONCE'
compiletime_assert_rwonce_type(x); \
^
include/asm-generic/rwonce.h:36:21: note: expanded from macro 'compiletime_assert_rwonce_type'
compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
^
include/linux/compiler_types.h:316:3: note: expanded from macro '__native_word'
(sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \
^
net/ipv4/tcp_input.c:5325:6: note: Left side of '||' is false
if (RB_EMPTY_ROOT(&tp->out_of_order_queue))
^
include/linux/rbtree.h:30:31: note: expanded from macro 'RB_EMPTY_ROOT'
#define RB_EMPTY_ROOT(root) (READ_ONCE((root)->rb_node) == NULL)
^
include/asm-generic/rwonce.h:49:2: note: expanded from macro 'READ_ONCE'
compiletime_assert_rwonce_type(x); \
^
include/asm-generic/rwonce.h:36:21: note: expanded from macro 'compiletime_assert_rwonce_type'
compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
^
include/linux/compiler_types.h:316:3: note: expanded from macro '__native_word'
(sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \
^
net/ipv4/tcp_input.c:5325:6: note: Left side of '||' is false
if (RB_EMPTY_ROOT(&tp->out_of_order_queue))
^
include/linux/rbtree.h:30:31: note: expanded from macro 'RB_EMPTY_ROOT'
#define RB_EMPTY_ROOT(root) (READ_ONCE((root)->rb_node) == NULL)
^
include/asm-generic/rwonce.h:49:2: note: expanded from macro 'READ_ONCE'
compiletime_assert_rwonce_type(x); \
^
include/asm-generic/rwonce.h:36:21: note: expanded from macro 'compiletime_assert_rwonce_type'
compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
^
include/linux/compiler_types.h:316:3: note: expanded from macro '__native_word'
(sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \
^
net/ipv4/tcp_input.c:5325:6: note: Left side of '||' is true
if (RB_EMPTY_ROOT(&tp->out_of_order_queue))
^
include/linux/rbtree.h:30:31: note: expanded from macro 'RB_EMPTY_ROOT'
#define RB_EMPTY_ROOT(root) (READ_ONCE((root)->rb_node) == NULL)
^
include/asm-generic/rwonce.h:49:2: note: expanded from macro 'READ_ONCE'
compiletime_assert_rwonce_type(x); \
^
include/asm-generic/rwonce.h:36:38: note: expanded from macro 'compiletime_assert_rwonce_type'
compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
^
net/ipv4/tcp_input.c:5325:6: note: Taking false branch
if (RB_EMPTY_ROOT(&tp->out_of_order_queue))
^
include/linux/rbtree.h:30:31: note: expanded from macro 'RB_EMPTY_ROOT'
#define RB_EMPTY_ROOT(root) (READ_ONCE((root)->rb_node) == NULL)
^
include/asm-generic/rwonce.h:49:2: note: expanded from macro 'READ_ONCE'
compiletime_assert_rwonce_type(x); \
^
include/asm-generic/rwonce.h:36:2: note: expanded from macro 'compiletime_assert_rwonce_type'
compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
^
include/linux/compiler_types.h:349:2: note: expanded from macro 'compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
^
include/linux/compiler_types.h:337:2: note: expanded from macro '_compiletime_assert'
__compiletime_assert(condition, msg, prefix, suffix)
^
include/linux/compiler_types.h:329:3: note: expanded from macro '__compiletime_assert'
if (!(condition)) \
^
net/ipv4/tcp_input.c:5325:6: note: Loop condition is false. Exiting loop
if (RB_EMPTY_ROOT(&tp->out_of_order_queue))
^
include/linux/rbtree.h:30:31: note: expanded from macro 'RB_EMPTY_ROOT'
#define RB_EMPTY_ROOT(root) (READ_ONCE((root)->rb_node) == NULL)
^
include/asm-generic/rwonce.h:49:2: note: expanded from macro 'READ_ONCE'
compiletime_assert_rwonce_type(x); \
vim +/reason +5010 net/ipv4/tcp_input.c
03f45c883c6f391 Eric Dumazet 2018-04-16 4987
^1da177e4c3f415 Linus Torvalds 2005-04-16 4988 static void tcp_data_queue(struct sock *sk, struct sk_buff *skb)
^1da177e4c3f415 Linus Torvalds 2005-04-16 4989 {
^1da177e4c3f415 Linus Torvalds 2005-04-16 4990 struct tcp_sock *tp = tcp_sk(sk);
a7ec381049c0d1f Menglong Dong 2022-02-20 4991 enum skb_drop_reason reason;
5357f0bd4edf0b3 Eric Dumazet 2017-08-01 4992 bool fragstolen;
5357f0bd4edf0b3 Eric Dumazet 2017-08-01 4993 int eaten;
^1da177e4c3f415 Linus Torvalds 2005-04-16 4994
6787b7e350d3552 Jianguo Wu 2021-07-09 4995 /* If a subflow has been reset, the packet should not continue
6787b7e350d3552 Jianguo Wu 2021-07-09 4996 * to be processed, drop the packet.
6787b7e350d3552 Jianguo Wu 2021-07-09 4997 */
6787b7e350d3552 Jianguo Wu 2021-07-09 4998 if (sk_is_mptcp(sk) && !mptcp_incoming_options(sk, skb)) {
6787b7e350d3552 Jianguo Wu 2021-07-09 4999 __kfree_skb(skb);
6787b7e350d3552 Jianguo Wu 2021-07-09 5000 return;
6787b7e350d3552 Jianguo Wu 2021-07-09 5001 }
648ef4b88673dad Mat Martineau 2020-01-21 5002
532182cd610782d Eric Dumazet 2016-04-01 5003 if (TCP_SKB_CB(skb)->seq == TCP_SKB_CB(skb)->end_seq) {
532182cd610782d Eric Dumazet 2016-04-01 5004 __kfree_skb(skb);
532182cd610782d Eric Dumazet 2016-04-01 5005 return;
532182cd610782d Eric Dumazet 2016-04-01 5006 }
f84af32cbca70a3 Eric Dumazet 2010-04-28 5007 skb_dst_drop(skb);
155c6e1ad4a778c Peter Pan(潘卫平 2014-09-24 5008) __skb_pull(skb, tcp_hdr(skb)->doff * 4);
^1da177e4c3f415 Linus Torvalds 2005-04-16 5009
a7ec381049c0d1f Menglong Dong 2022-02-20 @5010 reason = SKB_DROP_REASON_NOT_SPECIFIED;
^1da177e4c3f415 Linus Torvalds 2005-04-16 5011 tp->rx_opt.dsack = 0;
^1da177e4c3f415 Linus Torvalds 2005-04-16 5012
^1da177e4c3f415 Linus Torvalds 2005-04-16 5013 /* Queue data for delivery to the user.
^1da177e4c3f415 Linus Torvalds 2005-04-16 5014 * Packets in sequence go to the receive queue.
^1da177e4c3f415 Linus Torvalds 2005-04-16 5015 * Out of sequence packets to the out_of_order_queue.
^1da177e4c3f415 Linus Torvalds 2005-04-16 5016 */
^1da177e4c3f415 Linus Torvalds 2005-04-16 5017 if (TCP_SKB_CB(skb)->seq == tp->rcv_nxt) {
fb223502ec08894 Yafang Shao 2018-06-24 5018 if (tcp_receive_window(tp) == 0) {
a7ec381049c0d1f Menglong Dong 2022-02-20 5019 reason = SKB_DROP_REASON_TCP_ZEROWINDOW;
fb223502ec08894 Yafang Shao 2018-06-24 5020 NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPZEROWINDOWDROP);
^1da177e4c3f415 Linus Torvalds 2005-04-16 5021 goto out_of_window;
fb223502ec08894 Yafang Shao 2018-06-24 5022 }
^1da177e4c3f415 Linus Torvalds 2005-04-16 5023
^1da177e4c3f415 Linus Torvalds 2005-04-16 5024 /* Ok. In sequence. In window. */
^1da177e4c3f415 Linus Torvalds 2005-04-16 5025 queue_and_out:
76dfa6082032b5c Eric Dumazet 2015-05-15 5026 if (skb_queue_len(&sk->sk_receive_queue) == 0)
76dfa6082032b5c Eric Dumazet 2015-05-15 5027 sk_forced_mem_schedule(sk, skb->truesize);
ea5d0c32498e1a0 Yafang Shao 2018-06-28 5028 else if (tcp_try_rmem_schedule(sk, skb, skb->truesize)) {
a7ec381049c0d1f Menglong Dong 2022-02-20 5029 reason = SKB_DROP_REASON_PROTO_MEM;
ea5d0c32498e1a0 Yafang Shao 2018-06-28 5030 NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPRCVQDROP);
ba3bb0e76ccd464 Eric Dumazet 2020-06-30 5031 sk->sk_data_ready(sk);
^1da177e4c3f415 Linus Torvalds 2005-04-16 5032 goto drop;
ea5d0c32498e1a0 Yafang Shao 2018-06-28 5033 }
5357f0bd4edf0b3 Eric Dumazet 2017-08-01 5034
e7395f1f4ba24dc Eric Dumazet 2018-11-26 5035 eaten = tcp_queue_rcv(sk, skb, &fragstolen);
^1da177e4c3f415 Linus Torvalds 2005-04-16 5036 if (skb->len)
9e412ba7632f712 Ilpo Järvinen 2007-04-20 5037 tcp_event_data_recv(sk, skb);
155c6e1ad4a778c Peter Pan(潘卫平 2014-09-24 5038) if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN)
20c4cb792de2b58 Eric Dumazet 2011-10-20 5039 tcp_fin(sk);
^1da177e4c3f415 Linus Torvalds 2005-04-16 5040
9f5afeae51526b3 Yaogong Wang 2016-09-07 5041 if (!RB_EMPTY_ROOT(&tp->out_of_order_queue)) {
^1da177e4c3f415 Linus Torvalds 2005-04-16 5042 tcp_ofo_queue(sk);
^1da177e4c3f415 Linus Torvalds 2005-04-16 5043
15bdd5686c2c613 Yuchung Cheng 2018-08-09 5044 /* RFC5681. 4.2. SHOULD send immediate ACK, when
^1da177e4c3f415 Linus Torvalds 2005-04-16 5045 * gap in queue is filled.
^1da177e4c3f415 Linus Torvalds 2005-04-16 5046 */
9f5afeae51526b3 Yaogong Wang 2016-09-07 5047 if (RB_EMPTY_ROOT(&tp->out_of_order_queue))
15bdd5686c2c613 Yuchung Cheng 2018-08-09 5048 inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_NOW;
^1da177e4c3f415 Linus Torvalds 2005-04-16 5049 }
^1da177e4c3f415 Linus Torvalds 2005-04-16 5050
^1da177e4c3f415 Linus Torvalds 2005-04-16 5051 if (tp->rx_opt.num_sacks)
^1da177e4c3f415 Linus Torvalds 2005-04-16 5052 tcp_sack_remove(tp);
^1da177e4c3f415 Linus Torvalds 2005-04-16 5053
31770e34e43d6c8 Florian Westphal 2017-08-30 5054 tcp_fast_path_check(sk);
31770e34e43d6c8 Florian Westphal 2017-08-30 5055
923dd347b8904c2 Eric Dumazet 2012-05-02 5056 if (eaten > 0)
923dd347b8904c2 Eric Dumazet 2012-05-02 5057 kfree_skb_partial(skb, fragstolen);
1d57f19539c0741 Eric Dumazet 2012-09-17 5058 if (!sock_flag(sk, SOCK_DEAD))
03f45c883c6f391 Eric Dumazet 2018-04-16 5059 tcp_data_ready(sk);
^1da177e4c3f415 Linus Torvalds 2005-04-16 5060 return;
^1da177e4c3f415 Linus Torvalds 2005-04-16 5061 }
^1da177e4c3f415 Linus Torvalds 2005-04-16 5062
^1da177e4c3f415 Linus Torvalds 2005-04-16 5063 if (!after(TCP_SKB_CB(skb)->end_seq, tp->rcv_nxt)) {
7788174e8726c30 Yuchung Cheng 2018-08-29 5064 tcp_rcv_spurious_retrans(sk, skb);
^1da177e4c3f415 Linus Torvalds 2005-04-16 5065 /* A retransmit, 2nd most common case. Force an immediate ack. */
a7ec381049c0d1f Menglong Dong 2022-02-20 5066 reason = SKB_DROP_REASON_TCP_OLD_DATA;
c10d9310edf5aa4 Eric Dumazet 2016-04-29 5067 NET_INC_STATS(sock_net(sk), LINUX_MIB_DELAYEDACKLOST);
1ed834655a0d42e Pavel Emelyanov 2008-07-16 5068 tcp_dsack_set(sk, TCP_SKB_CB(skb)->seq, TCP_SKB_CB(skb)->end_seq);
^1da177e4c3f415 Linus Torvalds 2005-04-16 5069
^1da177e4c3f415 Linus Torvalds 2005-04-16 5070 out_of_window:
9a9c9b51e546188 Eric Dumazet 2018-05-21 5071 tcp_enter_quickack_mode(sk, TCP_MAX_QUICKACKS);
463c84b97f24010 Arnaldo Carvalho de Melo 2005-08-09 5072 inet_csk_schedule_ack(sk);
^1da177e4c3f415 Linus Torvalds 2005-04-16 5073 drop:
a7ec381049c0d1f Menglong Dong 2022-02-20 5074 tcp_drop_reason(sk, skb, reason);
^1da177e4c3f415 Linus Torvalds 2005-04-16 5075 return;
^1da177e4c3f415 Linus Torvalds 2005-04-16 5076 }
^1da177e4c3f415 Linus Torvalds 2005-04-16 5077
^1da177e4c3f415 Linus Torvalds 2005-04-16 5078 /* Out of window. F.e. zero window probe. */
a7ec381049c0d1f Menglong Dong 2022-02-20 5079 if (!before(TCP_SKB_CB(skb)->seq,
a7ec381049c0d1f Menglong Dong 2022-02-20 5080 tp->rcv_nxt + tcp_receive_window(tp))) {
a7ec381049c0d1f Menglong Dong 2022-02-20 5081 reason = SKB_DROP_REASON_TCP_OVERWINDOW;
^1da177e4c3f415 Linus Torvalds 2005-04-16 5082 goto out_of_window;
a7ec381049c0d1f Menglong Dong 2022-02-20 5083 }
^1da177e4c3f415 Linus Torvalds 2005-04-16 5084
^1da177e4c3f415 Linus Torvalds 2005-04-16 5085 if (before(TCP_SKB_CB(skb)->seq, tp->rcv_nxt)) {
^1da177e4c3f415 Linus Torvalds 2005-04-16 5086 /* Partial packet, seq < rcv_next < end_seq */
1ed834655a0d42e Pavel Emelyanov 2008-07-16 5087 tcp_dsack_set(sk, TCP_SKB_CB(skb)->seq, tp->rcv_nxt);
^1da177e4c3f415 Linus Torvalds 2005-04-16 5088
^1da177e4c3f415 Linus Torvalds 2005-04-16 5089 /* If window is closed, drop tail of packet. But after
^1da177e4c3f415 Linus Torvalds 2005-04-16 5090 * remembering D-SACK for its head made in previous line.
^1da177e4c3f415 Linus Torvalds 2005-04-16 5091 */
fb223502ec08894 Yafang Shao 2018-06-24 5092 if (!tcp_receive_window(tp)) {
a7ec381049c0d1f Menglong Dong 2022-02-20 5093 reason = SKB_DROP_REASON_TCP_ZEROWINDOW;
fb223502ec08894 Yafang Shao 2018-06-24 5094 NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPZEROWINDOWDROP);
^1da177e4c3f415 Linus Torvalds 2005-04-16 5095 goto out_of_window;
fb223502ec08894 Yafang Shao 2018-06-24 5096 }
^1da177e4c3f415 Linus Torvalds 2005-04-16 5097 goto queue_and_out;
^1da177e4c3f415 Linus Torvalds 2005-04-16 5098 }
^1da177e4c3f415 Linus Torvalds 2005-04-16 5099
e86b291962cbf47 Eric Dumazet 2012-03-18 5100 tcp_data_queue_ofo(sk, skb);
^1da177e4c3f415 Linus Torvalds 2005-04-16 5101 }
^1da177e4c3f415 Linus Torvalds 2005-04-16 5102
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org
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2022-02-26 4:34 [linux-next:master 6903/8646] net/ipv4/tcp_input.c:5010:2: warning: Value stored to 'reason' is never read [clang-analyzer-deadcode.DeadStores] kernel test robot
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