Add the following check, to detect bugs sooner for CONFIG_DEBUG_NET=y builds. DEBUG_NET_WARN_ON_ONCE(skb->data < skb->head); Signed-off-by: Eric Dumazet --- include/linux/skbuff.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index e6bfe5d0c5252b2e7540e1fef9317aab83feced2..8b399ddf1b9bd0dddb37f417ccfa5ea675efafa3 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -2813,6 +2813,7 @@ static inline void *__skb_push(struct sk_buff *skb, unsigned int len) DEBUG_NET_WARN_ON_ONCE(len > INT_MAX); skb->data -= len; + DEBUG_NET_WARN_ON_ONCE(skb->data < skb->head); skb->len += len; return skb->data; } -- 2.53.0.rc1.225.gd81095ad13-goog