3.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: "Yan, Zheng" <zheng.z....@intel.com>
(cherry picked from commit 3e8f43a089f06279c5f76a9ccd42578eebf7bfa5)
When i >= newmap->m_max_mds, ceph_mdsmap_get_addr(newmap, i) return
NULL. Passing NULL to memcmp() triggers oops.
Signed-off-by: Yan, Zheng <zheng.z....@intel.com>
Signed-off-by: Sage Weil <s...@inktank.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
fs/ceph/mds_client.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -2634,7 +2634,8 @@ static void check_new_map(struct ceph_md
ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
session_state_name(s->s_state));
- if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
+ if (i >= newmap->m_max_mds ||
+ memcmp(ceph_mdsmap_get_addr(oldmap, i),
ceph_mdsmap_get_addr(newmap, i),
sizeof(struct ceph_entity_addr))) {
if (s->s_state == CEPH_MDS_SESSION_OPENING) {
--
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