xfrm: fix refcount leak in __xfrm_policy_check()

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[ Upstream commit 9c9cb23e00 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Xin Xiong 2022-07-24 17:55:58 +08:00 • committed by Greg Kroah-Hartman

parent 4500aa1135

commit d66c052879

1 changed files with 1 additions and 0 deletions

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net/xfrm/xfrm_policy.c

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