diff options
| author | tang.junhui | 2016-11-04 05:37:09 +0100 |
|---|---|---|
| committer | Mike Snitzer | 2016-11-21 15:52:08 +0100 |
| commit | cc5bd925f194c8dc7e2a4eee2c81a4f148018b08 (patch) | |
| tree | 4d8f3d715414945d7b462dd1e1824ddfa53989e8 /drivers/md | |
| parent | dm mpath: add m->hw_handler_name NULL pointer check in parse_hw_handler() (diff) | |
| download | kernel-qcow2-linux-cc5bd925f194c8dc7e2a4eee2c81a4f148018b08.tar.gz kernel-qcow2-linux-cc5bd925f194c8dc7e2a4eee2c81a4f148018b08.tar.xz kernel-qcow2-linux-cc5bd925f194c8dc7e2a4eee2c81a4f148018b08.zip | |
dm mpath: add checks for priority group count to avoid invalid memory access
This avoids the potential for invalid memory access, if/when there are
no priority groups, in response to invalid arguments being sent by the
user via DM message (e.g. "switch_group", "disable_group" or
"enable_group").
Signed-off-by: tang.junhui <tang.junhui@zte.com.cn>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-mpath.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c index d234b6c33646..f8369697af12 100644 --- a/drivers/md/dm-mpath.c +++ b/drivers/md/dm-mpath.c @@ -1364,7 +1364,7 @@ static int switch_pg_num(struct multipath *m, const char *pgstr) char dummy; if (!pgstr || (sscanf(pgstr, "%u%c", &pgnum, &dummy) != 1) || !pgnum || - (pgnum > m->nr_priority_groups)) { + !m->nr_priority_groups || (pgnum > m->nr_priority_groups)) { DMWARN("invalid PG number supplied to switch_pg_num"); return -EINVAL; } @@ -1396,7 +1396,7 @@ static int bypass_pg_num(struct multipath *m, const char *pgstr, bool bypassed) char dummy; if (!pgstr || (sscanf(pgstr, "%u%c", &pgnum, &dummy) != 1) || !pgnum || - (pgnum > m->nr_priority_groups)) { + !m->nr_priority_groups || (pgnum > m->nr_priority_groups)) { DMWARN("invalid PG number supplied to bypass_pg"); return -EINVAL; } |