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net: warn if transport header was not set

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Make sure skb_transport_header() and skb_transport_offset() uses
are not fooled if the transport header has not been set.

This change will likely expose existing bugs in linux networking stacks.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2022-05-09 20:57:39 -07:00 committed by David S. Miller
parent d268c1f5cf
commit 66e4c8d950
1 changed files with 2 additions and 0 deletions
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2
include/linux/skbuff.h
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@ -42,6 +42,7 @@
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
#include <linux/netfilter/nf_conntrack_common.h>
#endif
#include <net/net_debug.h>
/**
* DOC: skb checksums
@ -2904,6 +2905,7 @@ static inline bool skb_transport_header_was_set(const struct sk_buff *skb)
static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
{
DEBUG_NET_WARN_ON_ONCE(!skb_transport_header_was_set(skb));
return skb->head + skb->transport_header;
}