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| author | Luis Henriques <lhenriques@suse.com> | 2018-11-05 19:00:52 +0000 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2018-11-08 17:51:11 +0100 |
| commit | 71f2cc64d027d712f29bf8d09d3e123302d5f245 (patch) | |
| tree | 1544bc4e5ac8b4588f015352e83f5595e70755b7 /fs/ceph/quota.c | |
| parent | c2c6d3ce0d9a1fae4472fc10755372d022a487a4 (diff) | |
| download | linux-71f2cc64d027d712f29bf8d09d3e123302d5f245.tar.gz linux-71f2cc64d027d712f29bf8d09d3e123302d5f245.tar.bz2 linux-71f2cc64d027d712f29bf8d09d3e123302d5f245.zip | |
ceph: quota: fix null pointer dereference in quota check
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>
Diffstat (limited to 'fs/ceph/quota.c')
| -rw-r--r-- | fs/ceph/quota.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/ceph/quota.c b/fs/ceph/quota.c index 32d4f13784ba..03f4d24db8fe 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; |