* Patch "gre: do not pull header in ICMP error processing" has been added to the 4.4-stable tree
@ 2016-05-16 18:25 gregkh
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From: gregkh @ 2016-05-16 18:25 UTC (permalink / raw)
To: jbenc, davem, gregkh; +Cc: stable, stable-commits
This is a note to let you know that I've just added the patch titled
gre: do not pull header in ICMP error processing
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
gre-do-not-pull-header-in-icmp-error-processing.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From foo@baz Mon May 16 11:21:32 PDT 2016
From: Jiri Benc <jbenc@redhat.com>
Date: Fri, 29 Apr 2016 23:31:32 +0200
Subject: gre: do not pull header in ICMP error processing
From: Jiri Benc <jbenc@redhat.com>
[ Upstream commit b7f8fe251e4609e2a437bd2c2dea01e61db6849c ]
iptunnel_pull_header expects that IP header was already pulled; with this
expectation, it pulls the tunnel header. This is not true in gre_err.
Furthermore, ipv4_update_pmtu and ipv4_redirect expect that skb->data points
to the IP header.
We cannot pull the tunnel header in this path. It's just a matter of not
calling iptunnel_pull_header - we don't need any of its effects.
Fixes: bda7bb463436 ("gre: Allow multiple protocol listener for gre protocol.")
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/ipv4/ip_gre.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -180,6 +180,7 @@ static __be16 tnl_flags_to_gre_flags(__b
return flags;
}
+/* Fills in tpi and returns header length to be pulled. */
static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
bool *csum_err)
{
@@ -239,7 +240,7 @@ static int parse_gre_header(struct sk_bu
return -EINVAL;
}
}
- return iptunnel_pull_header(skb, hdr_len, tpi->proto);
+ return hdr_len;
}
static void ipgre_err(struct sk_buff *skb, u32 info,
@@ -342,7 +343,7 @@ static void gre_err(struct sk_buff *skb,
struct tnl_ptk_info tpi;
bool csum_err = false;
- if (parse_gre_header(skb, &tpi, &csum_err)) {
+ if (parse_gre_header(skb, &tpi, &csum_err) < 0) {
if (!csum_err) /* ignore csum errors. */
return;
}
@@ -420,6 +421,7 @@ static int gre_rcv(struct sk_buff *skb)
{
struct tnl_ptk_info tpi;
bool csum_err = false;
+ int hdr_len;
#ifdef CONFIG_NET_IPGRE_BROADCAST
if (ipv4_is_multicast(ip_hdr(skb)->daddr)) {
@@ -429,7 +431,10 @@ static int gre_rcv(struct sk_buff *skb)
}
#endif
- if (parse_gre_header(skb, &tpi, &csum_err) < 0)
+ hdr_len = parse_gre_header(skb, &tpi, &csum_err);
+ if (hdr_len < 0)
+ goto drop;
+ if (iptunnel_pull_header(skb, hdr_len, tpi.proto) < 0)
goto drop;
if (ipgre_rcv(skb, &tpi) == PACKET_RCVD)
Patches currently in stable-queue which might be from jbenc@redhat.com are
queue-4.4/gre-do-not-pull-header-in-icmp-error-processing.patch
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2016-05-16 18:25 Patch "gre: do not pull header in ICMP error processing" has been added to the 4.4-stable tree gregkh
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