From: Herbert Xu Date: Tue, 17 Nov 2009 13:18:18 +0000 (-0800) Subject: gro: Fix illegal merging of trailer trash X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=69c0cab120a85471054614418b447349caba22d7;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git gro: Fix illegal merging of trailer trash When we've merged skb's with page frags, and subsequently receive a trailer skb (< MSS) that is not completely non-linear (this can occur on Intel NICs if the packet size falls below the threshold), GRO ends up producing an illegal GSO skb with a frag_list. This is harmless unless the skb is then forwarded through an interface that requires software GSO, whereupon the GSO code will BUG. This patch detects this case in GRO and avoids merging the trailer skb. Reported-by: Mark Wagner Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 80a96166df39..ec85681a7dd8 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -2701,7 +2701,8 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb) NAPI_GRO_CB(skb)->free = 1; goto done; - } + } else if (skb_gro_len(p) != pinfo->gso_size) + return -E2BIG; headroom = skb_headroom(p); nskb = netdev_alloc_skb(p->dev, headroom + skb_gro_offset(p));