linux-kernel - [PATCH 3.16 059/245] dm flakey: check for null arg_name in parse

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Date:   Fri, 24 Apr 2020 00:04:46 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Mike Snitzer" <snitzer@...hat.com>,
        "Goldwyn Rodrigues" <rgoldwyn@...e.com>
Subject: [PATCH 3.16 059/245] dm flakey: check for null arg_name in
 parse_features()

3.16.83-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Goldwyn Rodrigues <rgoldwyn@...e.com>

commit 7690e25302dc7d0cd42b349e746fe44b44a94f2b upstream.

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@...e.com>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/md/dm-flakey.c | 5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -69,6 +69,11 @@ static int parse_features(struct dm_arg_
 		arg_name = dm_shift_arg(as);
 		argc--;
 
+		if (!arg_name) {
+			ti->error = "Insufficient feature arguments";
+			return -EINVAL;
+		}
+
 		/*
 		 * drop_writes
 		 */