From: Herbert Xu Date: Fri, 26 Dec 2008 22:57:42 +0000 (-0800) Subject: gro: Fix potential use after free X-Git-Tag: v2.6.29-rc1~581^2~3 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=0da2afd59653d2edf5c8e0f09b23f367ab5bc80f;p=linux-2.6-omap-h63xx.git gro: Fix potential use after free The initial skb may have been freed after napi_gro_complete in napi_gro_receive if it was merged into an existing packet. Thus we cannot check same_flow (which indicates whether it was merged) after calling napi_gro_complete. This patch fixes this by saving the same_flow status before the call to napi_gro_complete. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- diff --git a/net/core/dev.c b/net/core/dev.c index 536a8ac189c..303e984ee6a 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2390,6 +2390,7 @@ int napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) __be16 type = skb->protocol; struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK]; int count = 0; + int same_flow; int mac_len; if (!(skb->dev->features & NETIF_F_GRO)) @@ -2425,6 +2426,8 @@ int napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) if (&ptype->list == head) goto normal; + same_flow = NAPI_GRO_CB(skb)->same_flow; + if (pp) { struct sk_buff *nskb = *pp; @@ -2434,7 +2437,7 @@ int napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) count--; } - if (NAPI_GRO_CB(skb)->same_flow) + if (same_flow) goto ok; if (NAPI_GRO_CB(skb)->flush || count >= MAX_GRO_SKBS) {