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xfrm: fix refcount leak in __xfrm_policy_check() 

The issue happens on an error path in __xfrm_policy_check(). When the
fetching process of the object `pols[1]` fails, the function simply
returns 0, forgetting to decrement the reference count of `pols[0]`,
which is incremented earlier by either xfrm_sk_policy_lookup() or
xfrm_policy_lookup(). This may result in memory leaks.

Fix it by decreasing the reference count of `pols[0]` in that path.

Fixes: 134b0fc544 ("IPsec: propagate security module errors up from flow_cache_lookup")
Signed-off-by: Xin Xiong <xiongx18@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Xin Xiong 2022-07-24 17:55:58 +08:00 committed by Steffen Klassert
parent 9b134b1694
commit 9c9cb23e00
1 changed files with 1 additions and 0 deletions
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net/xfrm/xfrm_policy.c
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@ -3599,6 +3599,7 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
if (pols[1]) { if (pols[1]) {
if (IS_ERR(pols[1])) { if (IS_ERR(pols[1])) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR);
xfrm_pol_put(pols[0]);
return 0; return 0;
} }
pols[1]->curlft.use_time = ktime_get_real_seconds(); pols[1]->curlft.use_time = ktime_get_real_seconds();