From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Al Viro <viro@zeniv.linux.org.uk>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 4.9 01/13] autofs: fix a leak in autofs_expire_indirect()
Date: Fri, 22 Nov 2019 14:49:46 -0500 [thread overview]
Message-ID: <20191122194958.24926-1-sashal@kernel.org> (raw)
From: Al Viro <viro@zeniv.linux.org.uk>
[ Upstream commit 03ad0d703df75c43f78bd72e16124b5b94a95188 ]
if the second call of should_expire() in there ends up
grabbing and returning a new reference to dentry, we need
to drop it before continuing.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/autofs4/expire.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index 2e1f50e467f15..02f0d373adbf7 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -469,9 +469,10 @@ struct dentry *autofs4_expire_indirect(struct super_block *sb,
*/
flags &= ~AUTOFS_EXP_LEAVES;
found = should_expire(expired, mnt, timeout, how);
- if (!found || found != expired)
- /* Something has changed, continue */
+ if (found != expired) { // something has changed, continue
+ dput(found);
goto next;
+ }
if (expired != dentry)
dput(dentry);
--
2.20.1
next reply other threads:[~2019-11-22 19:52 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-22 19:49 Sasha Levin [this message]
2019-11-22 19:49 ` [PATCH AUTOSEL 4.9 02/13] RDMA/hns: Correct the value of HNS_ROCE_HEM_CHUNK_LEN Sasha Levin
2019-11-22 19:49 ` [PATCH AUTOSEL 4.9 03/13] exportfs_decode_fh(): negative pinned may become positive without the parent locked Sasha Levin
2019-11-22 19:49 ` [PATCH AUTOSEL 4.9 04/13] audit_get_nd(): don't unlock parent too early Sasha Levin
2019-11-22 19:49 ` [PATCH AUTOSEL 4.9 05/13] NFC: nxp-nci: Fix NULL pointer dereference after I2C communication error Sasha Levin
2019-11-22 19:49 ` [PATCH AUTOSEL 4.9 06/13] Input: cyttsp4_core - fix use after free bug Sasha Levin
2019-11-22 19:49 ` [PATCH AUTOSEL 4.9 07/13] ALSA: pcm: Fix stream lock usage in snd_pcm_period_elapsed() Sasha Levin
2019-11-22 19:49 ` [PATCH AUTOSEL 4.9 08/13] slip: Fix memory leak in slip_open error path Sasha Levin
2019-11-22 19:49 ` [PATCH AUTOSEL 4.9 09/13] net: cdc_ncm: Signedness bug in cdc_ncm_set_dgram_size() Sasha Levin
2019-11-22 19:49 ` [PATCH AUTOSEL 4.9 10/13] slcan: Fix memory leak in error path Sasha Levin
2019-11-22 19:49 ` [PATCH AUTOSEL 4.9 11/13] rsxx: add missed destroy_workqueue calls in remove Sasha Levin
2019-11-22 19:49 ` [PATCH AUTOSEL 4.9 12/13] ax88172a: fix information leak on short answers Sasha Levin
2019-11-22 19:49 ` [PATCH AUTOSEL 4.9 13/13] net: ep93xx_eth: fix mismatch of request_mem_region in remove Sasha Levin
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