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dm flakey: check for null arg_name in parse_features()

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[ Upstream commit 7690e25302dc7d0cd42b349e746fe44b44a94f2b ]

One can crash dm-flakey by specifying more feature arguments than the
number of features supplied.  Checking for null in arg_name avoids
this.

dmsetup create flakey-test --table "0 66076080 flakey /dev/sdb9 0 0 180 2 drop_writes"

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Goldwyn Rodrigues 2017-12-03 21:14:12 -06:00 • committed by Greg Kroah-Hartman
commit e0a272f8fd
1 changed files with 5 additions and 0 deletions
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5
drivers/md/dm-flakey.c
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@ -69,6 +69,11 @@ static int parse_features(struct dm_arg_set *as, struct flakey_c *fc,
arg_name = dm_shift_arg(as);
argc--;
if (!arg_name) {
ti->error = "Insufficient feature arguments";
return -EINVAL;
}
/*
* drop_writes
*/