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| author | Yan, Zheng <zheng.z.yan@intel.com> | 2012-09-20 13:42:25 +0400 |
|---|---|---|
| committer | Alex Elder <elder@inktank.com> | 2012-10-01 23:30:54 +0400 |
| commit | 3e8f43a089f06279c5f76a9ccd42578eebf7bfa5 (patch) | |
| tree | 5b208f18d8a3031b21ed379bca471dbf2fdb0e47 /fs/ceph/mds_client.c | |
| parent | 6e14b1a6c3b8d7e48ece68733d2dac0464611ee4 (diff) | |
| download | linux-3e8f43a089f06279c5f76a9ccd42578eebf7bfa5.tar.xz | |
ceph: Fix oops when handling mdsmap that decreases max_mds
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.yan@intel.com>
Signed-off-by: Sage Weil <sage@inktank.com>
Diffstat (limited to 'fs/ceph/mds_client.c')
| -rw-r--r-- | fs/ceph/mds_client.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index a5a735422aa7..1bcf712655d9 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -2625,7 +2625,8 @@ static void check_new_map(struct ceph_mds_client *mdsc, 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) { |