From: Steffen Klassert Date: Fri, 5 Jan 2018 07:35:47 +0000 (+0100) Subject: esp: Fix GRO when the headers not fully in the linear part of the skb. X-Git-Tag: microblaze-4.16-rc6~293^2~26^2~2 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=374d1b5a81f7f9cc5e7f095ac3d5aff3f6600376;p=linux-2.6-microblaze.git esp: Fix GRO when the headers not fully in the linear part of the skb. 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@syzkaller.appspotmail.com Signed-off-by: Steffen Klassert --- diff --git a/net/ipv4/esp4_offload.c b/net/ipv4/esp4_offload.c index f8b918c766b0..b1338e576d00 100644 --- a/net/ipv4/esp4_offload.c +++ b/net/ipv4/esp4_offload.c @@ -38,7 +38,8 @@ static struct sk_buff **esp4_gro_receive(struct sk_buff **head, __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; diff --git a/net/ipv6/esp6_offload.c b/net/ipv6/esp6_offload.c index 333a478aa161..dd9627490c7c 100644 --- a/net/ipv6/esp6_offload.c +++ b/net/ipv6/esp6_offload.c @@ -60,7 +60,8 @@ static struct sk_buff **esp6_gro_receive(struct sk_buff **head, 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;