batman-adv: mcast: ensure unshared skb for multicast packets

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When a packet is transmitted via a batman-adv interface and has already
enough room for the header then nothing will make sure that the skbuff is
unshared. But it is not allowed to modify a currently shared skbuff.

Always make sure that the pskb_expand_head() is not only called for a too
small header but also for shared skbuffs.

Cc: stable@vger.kernel.org
Fixes: 9003913322 ("batman-adv: mcast: implement multicast packet generation")
Signed-off-by: Sven Eckelmann <sven@narfation.org>

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Sven Eckelmann 2026-07-09 21:17:08 +02:00

parent 7aedb59b80

commit 82bf207f48

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net/batman-adv/multicast_forw.c

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