diff options
| author | Eric Dumazet <[email protected]> | 2024-11-05 17:44:02 +0000 |
|---|---|---|
| committer | Jakub Kicinski <[email protected]> | 2024-11-06 17:29:15 -0800 |
| commit | 305ae87dafc1a9f35374a783119d9e6001d1b8e0 (patch) | |
| tree | 2307c32bf50c569d939c9618a903115b7e56d406 | |
| parent | ae50ea52bdd77eabd8f3c4630c1b03c3373f61a5 (diff) | |
net: add debug check in skb_reset_network_header()
Make sure (skb->data - skb->head) can fit in skb->network_header
This needs CONFIG_DEBUG_NET=y.
Signed-off-by: Eric Dumazet <[email protected]>
Reviewed-by: Joe Damato <[email protected]>
Reviewed-by: Xuan Zhuo <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
| -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 f76524844e7e..f1e49a32880d 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -3027,7 +3027,10 @@ static inline unsigned char *skb_network_header(const struct sk_buff *skb) static inline void skb_reset_network_header(struct sk_buff *skb) { - skb->network_header = skb->data - skb->head; + long offset = skb->data - skb->head; + + DEBUG_NET_WARN_ON_ONCE(offset != (typeof(skb->network_header))offset); + skb->network_header = offset; } static inline void skb_set_network_header(struct sk_buff *skb, const int offset) |