linux-kernel - [PATCH 5.14 064/100] ceph: fix memory leak on decode error in ceph_handle

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Date:   Fri, 24 Sep 2021 14:44:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jeff Layton <jlayton@...nel.org>,
        Ilya Dryomov <idryomov@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.14 064/100] ceph: fix memory leak on decode error in ceph_handle_caps

From: Jeff Layton <jlayton@...nel.org>

[ Upstream commit 2ad32cf09bd28a21e6ad1595355a023ed631b529 ]

If we hit a decoding error late in the frame, then we might exit the
function without putting the pool_ns string. Ensure that we always put
that reference on the way out of the function.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
Reviewed-by: Ilya Dryomov <idryomov@...il.com>
Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/ceph/caps.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index ba562efdf07b..1f3d67133958 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -4137,8 +4137,9 @@ void ceph_handle_caps(struct ceph_mds_session *session,
 done:
 	mutex_unlock(&session->s_mutex);
 done_unlocked:
-	ceph_put_string(extra_info.pool_ns);
 	iput(inode);
+out:
+	ceph_put_string(extra_info.pool_ns);
 	return;
 
 flush_cap_releases:
@@ -4153,7 +4154,7 @@ flush_cap_releases:
 bad:
 	pr_err("ceph_handle_caps: corrupt message\n");
 	ceph_msg_dump(msg);
-	return;
+	goto out;
 }
 
 /*
-- 
2.33.0