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>

1 files changed, 8 insertions, 6 deletions

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)
 {