netfilter: nf_log: release skbuff on nlmsg put failure

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commit b51d3fa364 upstream.

The kernel should reserve enough room in the skb so that the DONE
message can always be appended.  However, in case of e.g. new attribute
erronously not being size-accounted for, __nfulnl_send() will still
try to put next nlmsg into this full skbuf, causing the skb to be stuck
forever and blocking delivery of further messages.

Fix issue by releasing skb immediately after nlmsg_put error and
WARN() so we can track down the cause of such size mismatch.

[ fw@strlen.de: add tailroom/len info to WARN ]

Signed-off-by: Houcheng Lin <houcheng@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

...

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Houcheng Lin 2014-10-23 10:36:08 +02:00 • committed by Luis Henriques

parent 87f00629f2

commit 7ef36feadd

1 changed files with 8 additions and 9 deletions

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net/netfilter/nfnetlink_log.c

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