提交 956d9dd3 编写于 作者: L Luis Henriques 提交者: Greg Kroah-Hartman

ceph: quota: fix null pointer dereference in quota check

[ Upstream commit 71f2cc64 ]

This patch fixes a possible null pointer dereference in
check_quota_exceeded, detected by the static checker smatch, with the
following warning:

   fs/ceph/quota.c:240 check_quota_exceeded()
    error: we previously assumed 'realm' could be null (see line 188)

Fixes: b7a29217 ("ceph: quota: support for ceph.quota.max_files")
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NLuis Henriques <lhenriques@suse.com>
Reviewed-by: N"Yan, Zheng" <zyan@redhat.com>
Signed-off-by: NIlya Dryomov <idryomov@gmail.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
上级 99074620
......@@ -237,7 +237,8 @@ static bool check_quota_exceeded(struct inode *inode, enum quota_check_op op,
ceph_put_snap_realm(mdsc, realm);
realm = next;
}
ceph_put_snap_realm(mdsc, realm);
if (realm)
ceph_put_snap_realm(mdsc, realm);
up_read(&mdsc->snap_rwsem);
return exceeded;
......
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