batman-adv: Even Batman should not dereference NULL pointers

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There's a problem in net/batman-adv/unicast.c::frag_send_skb().
dev_alloc_skb() allocates memory and may fail, thus returning NULL. If
this happens we'll pass a NULL pointer on to skb_split() which in turn
hands it to skb_split_inside_header() from where it gets passed to
skb_put() that lets skb_tail_pointer() play with it and that function
dereferences it. And thus the bat dies.

While I was at it I also moved the call to dev_alloc_skb() above the
assignment to 'unicast_packet' since there's no reason to do that
assignment if the memory allocation fails.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Sven Eckelmann <sven@narfation.org>

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Jesper Juhl 2011-01-13 21:53:38 +01:00 • committed by Sven Eckelmann

parent 53320fe3bb

commit ed7809d9c4

1 changed files with 4 additions and 2 deletions

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net/batman-adv/unicast.c

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