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net: add skb_header_pointer_careful() helper

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[ Upstream commit 13e00fdc9236bd4d0bff4109d2983171fbcb74c4 ]

This variant of skb_header_pointer() should be used in contexts
where @offset argument is user-controlled and could be negative.

Negative offsets are supported, as long as the zone starts
between skb->head and skb->data.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260128141539.3404400-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
[ Adjust context ]
Signed-off-by: Bin Lan <lanbincn@139.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Shivani: Modified to apply on 5.10.y ]
Signed-off-by: Shivani Agarwal <shivani.agarwal@broadcom.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Ulrich Hecht <uli@kernel.org>
This commit is contained in:
Eric Dumazet
2026-06-18 01:08:06 -07:00
committed by Ulrich Hecht
parent 21aba5959c
commit b8ec6b84c1
1 changed files with 12 additions and 0 deletions
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12
include/linux/skbuff.h
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@ -3459,6 +3459,18 @@ skb_header_pointer(const struct sk_buff *skb, int offset, int len, void *buffer)
skb_headlen(skb), buffer);
}
/* Variant of skb_header_pointer() where @offset is user-controlled
* and potentially negative.
*/
static inline void * __must_check
skb_header_pointer_careful(const struct sk_buff *skb, int offset,
int len, void *buffer)
{
if (unlikely(offset < 0 && -offset > skb_headroom(skb)))
return NULL;
return skb_header_pointer(skb, offset, len, buffer);
}
/**
* skb_needs_linearize - check if we need to linearize a given skb
* depending on the given device features.