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| author | Eric Dumazet <edumazet@google.com> | 2024-11-05 17:43:59 +0000 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-11-06 17:29:14 -0800 |
| commit | 1732e4bedb3e29986da6ea315e8bf8caf74e1e38 (patch) | |
| tree | 6cc3f2b2ad5b7a6411fd251ae834f14000a88920 /include | |
| parent | cfe8394e06f22847ecae0312bdd0b633b471b3f0 (diff) | |
| download | linux-stable-1732e4bedb3e29986da6ea315e8bf8caf74e1e38.tar.gz linux-stable-1732e4bedb3e29986da6ea315e8bf8caf74e1e38.tar.bz2 linux-stable-1732e4bedb3e29986da6ea315e8bf8caf74e1e38.zip | |
net: add debug check in skb_reset_inner_network_header()
Make sure (skb->data - skb->head) can fit in skb->inner_network_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/20241105174403.850330-4-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include')
| -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 75795568803c..8dafd1295a6e 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -2957,7 +2957,10 @@ static inline unsigned char *skb_inner_network_header(const struct sk_buff *skb) static inline void skb_reset_inner_network_header(struct sk_buff *skb) { - skb->inner_network_header = skb->data - skb->head; + long offset = skb->data - skb->head; + + DEBUG_NET_WARN_ON_ONCE(offset != (typeof(skb->inner_network_header))offset); + skb->inner_network_header = offset; } static inline void skb_set_inner_network_header(struct sk_buff *skb, |