3.18-stable review patch.  If anyone has any objections, please let me know.


From: Dan Carpenter <dan.carpen...@oracle.com>

[ Upstream commit 293dffaad8d500e1a5336eeb90d544cf40d4fbd8 ]

If there is not enough space then ceph_decode_32_safe() does a goto bad.
We need to return an error code in that situation.  The current code
returns ERR_PTR(0) which is NULL.  The callers are not expecting that
and it results in a NULL dereference.

Fixes: f24e9980eb86 ("ceph: OSD client")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
Reviewed-by: Ilya Dryomov <idryo...@gmail.com>
Signed-off-by: Ilya Dryomov <idryo...@gmail.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
 net/ceph/osdmap.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -270,6 +270,7 @@ static struct crush_map *crush_decode(vo
                u32 yes;
                struct crush_rule *r;
+               err = -EINVAL;
                ceph_decode_32_safe(p, end, yes, bad);
                if (!yes) {
                        dout("crush_decode NO rule %d off %x %p to %p\n",

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