net: skb_is_gso_v6() requires skb_is_gso()

bnx2x makes a dangerous use of skb_is_gso_v6().

It should first make sure skb is a gso packet

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Eilon Greenstein <eilong@broadcom.com>
Acked-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index 61726af..0c7fb1e 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -3256,14 +3256,16 @@ static u32 bnx2x_xmit_type(struct bnx2x *bp, struct sk_buff *skb)
        if (prot == IPPROTO_TCP)
                rc |= XMIT_CSUM_TCP;
 
-       if (skb_is_gso_v6(skb)) {
-               rc |= (XMIT_GSO_V6 | XMIT_CSUM_TCP);
-               if (rc & XMIT_CSUM_ENC)
-                       rc |= XMIT_GSO_ENC_V6;
-       } else if (skb_is_gso(skb)) {
-               rc |= (XMIT_GSO_V4 | XMIT_CSUM_TCP);
-               if (rc & XMIT_CSUM_ENC)
-                       rc |= XMIT_GSO_ENC_V4;
+       if (skb_is_gso(skb)) {
+               if (skb_is_gso_v6(skb)) {
+                       rc |= (XMIT_GSO_V6 | XMIT_CSUM_TCP);
+                       if (rc & XMIT_CSUM_ENC)
+                               rc |= XMIT_GSO_ENC_V6;
+               } else {
+                       rc |= (XMIT_GSO_V4 | XMIT_CSUM_TCP);
+                       if (rc & XMIT_CSUM_ENC)
+                               rc |= XMIT_GSO_ENC_V4;
+               }
        }
 
        return rc;

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 6d56840..d72d71e 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2755,6 +2755,7 @@ static inline bool skb_is_gso(const struct sk_buff *skb)
        return skb_shinfo(skb)->gso_size;
 }
 
+/* Note: Should be called only if skb_is_gso(skb) is true */
 static inline bool skb_is_gso_v6(const struct sk_buff *skb)
 {
        return skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6;