* [PATCH net] rxrpc: Fix memory leak in rxrpc_lookup_local
@ 2021-01-24 12:59 Takeshi Misawa
0 siblings, 0 replies; 3+ messages in thread
From: Takeshi Misawa @ 2021-01-24 12:59 UTC (permalink / raw)
To: David Howells; +Cc: netdev
Commit 9ebeddef58c4 ("rxrpc: rxrpc_peer needs to hold a ref on the rxrpc_local record")
Then release ref in __rxrpc_put_peer and rxrpc_put_peer_locked.
struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *local, gfp_t gfp)
- peer->local = local;
+ peer->local = rxrpc_get_local(local);
rxrpc_discard_prealloc also need ref release in discarding.
syzbot report:
BUG: memory leak
unreferenced object 0xffff8881080ddc00 (size 256):
comm "syz-executor339", pid 8462, jiffies 4294942238 (age 12.350s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 0a 00 00 00 00 c0 00 08 81 88 ff ff ................
backtrace:
[<000000002b6e495f>] kmalloc include/linux/slab.h:552 [inline]
[<000000002b6e495f>] kzalloc include/linux/slab.h:682 [inline]
[<000000002b6e495f>] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline]
[<000000002b6e495f>] rxrpc_lookup_local+0x1c1/0x760 net/rxrpc/local_object.c:244
[<000000006b43a77b>] rxrpc_bind+0x174/0x240 net/rxrpc/af_rxrpc.c:149
[<00000000fd447a55>] afs_open_socket+0xdb/0x200 fs/afs/rxrpc.c:64
[<000000007fd8867c>] afs_net_init+0x2b4/0x340 fs/afs/main.c:126
[<0000000063d80ec1>] ops_init+0x4e/0x190 net/core/net_namespace.c:152
[<00000000073c5efa>] setup_net+0xde/0x2d0 net/core/net_namespace.c:342
[<00000000a6744d5b>] copy_net_ns+0x19f/0x3e0 net/core/net_namespace.c:483
[<0000000017d3aec3>] create_new_namespaces+0x199/0x4f0 kernel/nsproxy.c:110
[<00000000186271ef>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:226
[<000000002de7bac4>] ksys_unshare+0x2fe/0x5c0 kernel/fork.c:2957
[<00000000349b12ba>] __do_sys_unshare kernel/fork.c:3025 [inline]
[<00000000349b12ba>] __se_sys_unshare kernel/fork.c:3023 [inline]
[<00000000349b12ba>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3023
[<000000006d178ef7>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
[<00000000637076d4>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
Fixes: 9ebeddef58c4 ("rxrpc: rxrpc_peer needs to hold a ref on the rxrpc_local record")
Signed-off-by: Takeshi Misawa <jeliantsurux@gmail.com>
Reported-and-tested-by: syzbot+305326672fed51b205f7@syzkaller.appspotmail.com
---
Dear David Howells
syzbot reported memory leak in rxrpc_lookup_local.
I send a patch that passed syzbot reproducer test.
Please consider this memory leak and patch.
syzbot link:
https://syzkaller.appspot.com/bug?id=80b2343d6c19226dfa59e33b151c168d96253420
Regards.
---
net/rxrpc/call_accept.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c
index 8df1964db333..a0b033954cea 100644
--- a/net/rxrpc/call_accept.c
+++ b/net/rxrpc/call_accept.c
@@ -197,6 +197,7 @@ void rxrpc_discard_prealloc(struct rxrpc_sock *rx)
tail = b->peer_backlog_tail;
while (CIRC_CNT(head, tail, size) > 0) {
struct rxrpc_peer *peer = b->peer_backlog[tail];
+ rxrpc_put_local(peer->local);
kfree(peer);
tail = (tail + 1) & (size - 1);
}
--
2.25.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH net] rxrpc: Fix memory leak in rxrpc_lookup_local
2021-01-28 10:48 David Howells
@ 2021-01-28 21:20 ` patchwork-bot+netdevbpf
0 siblings, 0 replies; 3+ messages in thread
From: patchwork-bot+netdevbpf @ 2021-01-28 21:20 UTC (permalink / raw)
To: David Howells
Cc: netdev, jeliantsurux, syzbot+305326672fed51b205f7, linux-afs,
linux-kernel
Hello:
This patch was applied to netdev/net.git (refs/heads/master):
On Thu, 28 Jan 2021 10:48:36 +0000 you wrote:
> From: Takeshi Misawa <jeliantsurux@gmail.com>
>
> Commit 9ebeddef58c4 ("rxrpc: rxrpc_peer needs to hold a ref on the rxrpc_local record")
> Then release ref in __rxrpc_put_peer and rxrpc_put_peer_locked.
>
> struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *local, gfp_t gfp)
> - peer->local = local;
> + peer->local = rxrpc_get_local(local);
>
> [...]
Here is the summary with links:
- [net] rxrpc: Fix memory leak in rxrpc_lookup_local
https://git.kernel.org/netdev/net/c/b8323f7288ab
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH net] rxrpc: Fix memory leak in rxrpc_lookup_local
@ 2021-01-28 10:48 David Howells
2021-01-28 21:20 ` patchwork-bot+netdevbpf
0 siblings, 1 reply; 3+ messages in thread
From: David Howells @ 2021-01-28 10:48 UTC (permalink / raw)
To: netdev
Cc: Takeshi Misawa, syzbot+305326672fed51b205f7, dhowells, linux-afs,
linux-kernel
From: Takeshi Misawa <jeliantsurux@gmail.com>
Commit 9ebeddef58c4 ("rxrpc: rxrpc_peer needs to hold a ref on the rxrpc_local record")
Then release ref in __rxrpc_put_peer and rxrpc_put_peer_locked.
struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *local, gfp_t gfp)
- peer->local = local;
+ peer->local = rxrpc_get_local(local);
rxrpc_discard_prealloc also need ref release in discarding.
syzbot report:
BUG: memory leak
unreferenced object 0xffff8881080ddc00 (size 256):
comm "syz-executor339", pid 8462, jiffies 4294942238 (age 12.350s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 0a 00 00 00 00 c0 00 08 81 88 ff ff ................
backtrace:
[<000000002b6e495f>] kmalloc include/linux/slab.h:552 [inline]
[<000000002b6e495f>] kzalloc include/linux/slab.h:682 [inline]
[<000000002b6e495f>] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline]
[<000000002b6e495f>] rxrpc_lookup_local+0x1c1/0x760 net/rxrpc/local_object.c:244
[<000000006b43a77b>] rxrpc_bind+0x174/0x240 net/rxrpc/af_rxrpc.c:149
[<00000000fd447a55>] afs_open_socket+0xdb/0x200 fs/afs/rxrpc.c:64
[<000000007fd8867c>] afs_net_init+0x2b4/0x340 fs/afs/main.c:126
[<0000000063d80ec1>] ops_init+0x4e/0x190 net/core/net_namespace.c:152
[<00000000073c5efa>] setup_net+0xde/0x2d0 net/core/net_namespace.c:342
[<00000000a6744d5b>] copy_net_ns+0x19f/0x3e0 net/core/net_namespace.c:483
[<0000000017d3aec3>] create_new_namespaces+0x199/0x4f0 kernel/nsproxy.c:110
[<00000000186271ef>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:226
[<000000002de7bac4>] ksys_unshare+0x2fe/0x5c0 kernel/fork.c:2957
[<00000000349b12ba>] __do_sys_unshare kernel/fork.c:3025 [inline]
[<00000000349b12ba>] __se_sys_unshare kernel/fork.c:3023 [inline]
[<00000000349b12ba>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3023
[<000000006d178ef7>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
[<00000000637076d4>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
Fixes: 9ebeddef58c4 ("rxrpc: rxrpc_peer needs to hold a ref on the rxrpc_local record")
Signed-off-by: Takeshi Misawa <jeliantsurux@gmail.com>
Reported-and-tested-by: syzbot+305326672fed51b205f7@syzkaller.appspotmail.com
Signed-off-by: David Howells <dhowells@redhat.com>
---
net/rxrpc/call_accept.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c
index 382add72c66f..1ae90fb97936 100644
--- a/net/rxrpc/call_accept.c
+++ b/net/rxrpc/call_accept.c
@@ -197,6 +197,7 @@ void rxrpc_discard_prealloc(struct rxrpc_sock *rx)
tail = b->peer_backlog_tail;
while (CIRC_CNT(head, tail, size) > 0) {
struct rxrpc_peer *peer = b->peer_backlog[tail];
+ rxrpc_put_local(peer->local);
kfree(peer);
tail = (tail + 1) & (size - 1);
}
^ permalink raw reply related [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-01-28 21:21 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2021-01-24 12:59 [PATCH net] rxrpc: Fix memory leak in rxrpc_lookup_local Takeshi Misawa
2021-01-28 10:48 David Howells
2021-01-28 21:20 ` patchwork-bot+netdevbpf
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