diff options
| author | Eric Dumazet <edumazet@google.com> | 2024-11-05 17:44:01 +0000 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-11-06 17:29:14 -0800 |
| commit | ae50ea52bdd77eabd8f3c4630c1b03c3373f61a5 (patch) | |
| tree | efe9d044abe92378afe76ae36ea299a2d81558c1 | |
| parent | 78a0cb2f45dc9327f26956c242f7f4b450efff49 (diff) | |
net: add debug check in skb_reset_transport_header()
Make sure (skb->data - skb->head) can fit in skb->transport_header
This needs CONFIG_DEBUG_NET=y.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Joe Damato <jdamato@fastly.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Link: https://patch.msgid.link/20241105174403.850330-6-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | include/linux/skbuff.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 32a7d8a65b9f..f76524844e7e 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -3007,7 +3007,10 @@ static inline unsigned char *skb_transport_header(const struct sk_buff *skb) static inline void skb_reset_transport_header(struct sk_buff *skb) { - skb->transport_header = skb->data - skb->head; + long offset = skb->data - skb->head; + + DEBUG_NET_WARN_ON_ONCE(offset != (typeof(skb->transport_header))offset); + skb->transport_header = offset; } static inline void skb_set_transport_header(struct sk_buff *skb, |