Commit 0e0497c0 authored Jun 22, 2009 by Mikulas Patocka Committed by Alasdair G Kergon Jun 22, 2009

dm mpath: validate table argument count



The parser reads the argument count as a number but doesn't check that
sufficient arguments are supplied. This command triggers the bug:

dmsetup create mpath --table "0 `blockdev --getsize /dev/mapper/cr0`
    multipath 0 0 2 1 round-robin 1000 0 1 1 /dev/mapper/cr0
    round-robin 0 1 1 /dev/mapper/cr1 1000"
kernel BUG at drivers/md/dm-mpath.c:530!

Cc: stable@kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

parent f234012f

drivers/md/dm-mpath.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -553,6 +553,12 @@ static int parse_path_selector(struct arg_set as, struct priority_group pg,
		return -EINVAL;
		}

		if (ps_argc > as->argc) {
		dm_put_path_selector(pst);
		ti->error = "not enough arguments for path selector";
		return -EINVAL;
		}

		r = pst->create(&pg->ps, ps_argc, as->argv);
		if (r) {
		dm_put_path_selector(pst);