> On Nov 5, 2018, at 19:00, Luis Henriques <lhenriques@xxxxxxxx> wrote: > > 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) > > Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> > Link: https://lkml.kernel.org/n/20181101065318.2cylxol6d444nzeu@kili.mountain > Fixes: b7a2921765cf ("ceph: quota: support for ceph.quota.max_files") > Signed-off-by: Luis Henriques <lhenriques@xxxxxxxx> > --- > 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 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; Applied, thanks. Yan, Zheng
