[PATCH 4.19 011/243] autofs: fix a leak in autofs_expire_indirect()

Greg Kroah-Hartman
2019-12-11T15:16:10Z

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/autofs/expire.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/autofs/expire.c b/fs/autofs/expire.c
index 28d9c2b1b3bb3..70e9afe589fbf 100644
--- a/fs/autofs/expire.c
+++ b/fs/autofs/expire.c
@@ -501,9 +501,10 @@ static struct dentry *autofs_expire_indirect(struct super_block *sb,
*/
how &= ~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