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(parent: 5c8ec91) | patch
netfilter: nf_conntrack: fix conntrack lookup race
authorPatrick McHardy <kaber@trash.net>
Mon, 22 Jun 2009 12:14:41 +0000 (14:14 +0200)
committerPatrick McHardy <kaber@trash.net>
Mon, 22 Jun 2009 12:14:41 +0000 (14:14 +0200)
commit8d8890b7751387f58ce0a6428773de2fbc0fd596
tree651b2f1da674823f386d4ba9165a6d81212e52cftree | snapshot
parent5c8ec910e789a92229978d8fd1fce7b62e8ac711commit | diff
netfilter: nf_conntrack: fix conntrack lookup race

The RCU protected conntrack hash lookup only checks whether the entry
has a refcount of zero to decide whether it is stale. This is not
sufficient, entries are explicitly removed while there is at least
one reference left, possibly more. Explicitly check whether the entry
has been marked as dying to fix this.

Signed-off-by: Patrick McHardy <kaber@trash.net>
net/netfilter/nf_conntrack_core.c diff | blob | history
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