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xfrm: fix a race in xfrm_state_lookup_byspi 

The returned xfrm_state should be hold before unlock xfrm_state_lock,
otherwise the returned xfrm_state maybe be released.

Fixes: c454997e6[{pktgen, xfrm} Introduce xfrm_state_lookup_byspi..]
Cc: Fan Du <fan.du@intel.com>
Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Acked-by: Fan Du <fan.du@intel.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Li RongQing 2015-04-29 08:42:44 +08:00 committed by Steffen Klassert
parent 39376ccb19
commit bdddbf6996
1 changed files with 1 additions and 1 deletions
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2
net/xfrm/xfrm_state.c
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@ -927,8 +927,8 @@ struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
x->id.spi != spi)
continue;
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
xfrm_state_hold(x);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
return x;
}
spin_unlock_bh(&net->xfrm.xfrm_state_lock);