This is a note to let you know that I've just added the patch titled
esp: Fix GRO when the headers not fully in the linear part of the skb.
to the 4.14-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:
esp-fix-gro-when-the-headers-not-fully-in-the-linear-part-of-the-skb.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 374d1b5a81f7f9cc5e7f095ac3d5aff3f6600376 Mon Sep 17 00:00:00 2001
From: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Date: Fri, 5 Jan 2018 08:35:47 +0100
Subject: esp: Fix GRO when the headers not fully in the linear part of the skb.
From: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
commit 374d1b5a81f7f9cc5e7f095ac3d5aff3f6600376 upstream.
The GRO layer does not necessarily pull the complete headers
into the linear part of the skb, a part may remain on the
first page fragment. This can lead to a crash if we try to
pull the headers, so make sure we have them on the linear
part before pulling.
Fixes: 7785bba299a8 ("esp: Add a software GRO codepath")
Reported-by: syzbot+82bbd65569c49c6c0c4d@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv4/esp4_offload.c | 3 ++-
net/ipv6/esp6_offload.c | 3 ++-
2 files changed, 4 insertions(+), 2 deletions(-)
--- a/net/ipv4/esp4_offload.c
+++ b/net/ipv4/esp4_offload.c
@@ -38,7 +38,8 @@ static struct sk_buff **esp4_gro_receive
__be32 spi;
int err;
- skb_pull(skb, offset);
+ if (!pskb_pull(skb, offset))
+ return NULL;
if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0)
goto out;
--- a/net/ipv6/esp6_offload.c
+++ b/net/ipv6/esp6_offload.c
@@ -60,7 +60,8 @@ static struct sk_buff **esp6_gro_receive
int nhoff;
int err;
- skb_pull(skb, offset);
+ if (!pskb_pull(skb, offset))
+ return NULL;
if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0)
goto out;
Patches currently in stable-queue which might be from steffen.klassert@xxxxxxxxxxx are
queue-4.14/xfrm-fix-stack-out-of-bounds-read-on-socket-policy-lookup.patch
queue-4.14/xfrm-skip-policies-marked-as-dead-while-rehashing.patch
queue-4.14/xfrm-fix-rcu-usage-in-xfrm_get_type_offload.patch
queue-4.14/esp-fix-gro-when-the-headers-not-fully-in-the-linear-part-of-the-skb.patch
queue-4.14/xfrm-don-t-call-xfrm_policy_cache_flush-while-holding-spinlock.patch
queue-4.14/xfrm-check-id-proto-in-validate_tmpl.patch