Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.18 35/59] ceph: quota: fix null pointer dereference in quota check | Date | Wed, 14 Nov 2018 17:23:07 -0500 |
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From: Luis Henriques <lhenriques@suse.com>
[ Upstream commit 71f2cc64d027d712f29bf8d09d3e123302d5f245 ]
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: b7a2921765cf ("ceph: quota: support for ceph.quota.max_files") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Luis Henriques <lhenriques@suse.com> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- fs/ceph/quota.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/ceph/quota.c b/fs/ceph/quota.c index 242bfa5c0539..47cc6f41d100 100644 --- a/fs/ceph/quota.c +++ b/fs/ceph/quota.c @@ -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; -- 2.17.1
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