net: add skb_header_pointer_careful() helper

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[ Upstream commit 13e00fdc92 ]

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>
Stable-dep-of: cabd1a9763 ("net/sched: cls_u32: use skb_header_pointer_careful()")
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Eric Dumazet 2026-01-28 14:15:38 +00:00 • committed by Greg Kroah-Hartman

parent f8611a7981

commit 9b186feb75

1 changed files with 12 additions and 0 deletions

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include/linux/skbuff.h

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