From ca07e43e288956a0ad5e6bd075f7aa1fca3bca00 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <edumazet@google.com>
Date: Sat, 6 Oct 2012 22:28:06 +0000
Subject: [PATCH] net: gro: fix a potential crash in skb_gro_reset_offset
Before accessing skb first fragment, better make sure there
is one.
This is probably not needed for old kernels, since an ethernet frame
cannot contain only an ethernet header, but the recent GRO addition
to tunnels makes this patch needed.
Also skb_gro_reset_offset() can be static, it actually allows
compiler to inline it.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
include/linux/netdevice.h | 1 -
net/core/dev.c | 14 ++++++++------
2 files changed, 8 insertions(+), 7 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 01646aa53b0e..a659fd0ba965 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1663,7 +1663,6 @@ extern int netpoll_trap(void);
#endif
extern int skb_gro_receive(struct sk_buff **head,
struct sk_buff *skb);
-extern void skb_gro_reset_offset(struct sk_buff *skb);
static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
{
diff --git a/net/core/dev.c b/net/core/dev.c
index 1e0a1847c3bb..de2bad717d56 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3631,20 +3631,22 @@ gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
}
EXPORT_SYMBOL(napi_skb_finish);
-void skb_gro_reset_offset(struct sk_buff *skb)
+static void skb_gro_reset_offset(struct sk_buff *skb)
{
+ const struct skb_shared_info *pinfo = skb_shinfo(skb);
+ const skb_frag_t *frag0 = &pinfo->frags[0];
+
NAPI_GRO_CB(skb)->data_offset = 0;
NAPI_GRO_CB(skb)->frag0 = NULL;
NAPI_GRO_CB(skb)->frag0_len = 0;
if (skb->mac_header == skb->tail &&
- !PageHighMem(skb_frag_page(&skb_shinfo(skb)->frags[0]))) {
- NAPI_GRO_CB(skb)->frag0 =
- skb_frag_address(&skb_shinfo(skb)->frags[0]);
- NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(&skb_shinfo(skb)->frags[0]);
+ pinfo->nr_frags &&
+ !PageHighMem(skb_frag_page(frag0))) {
+ NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0);
+ NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(frag0);
}
}
-EXPORT_SYMBOL(skb_gro_reset_offset);
gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
{