From: Goldwyn Rodrigues rgoldwyn@suse.com
[ 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 --- drivers/md/dm-flakey.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c index 78f403b45ab3e..bf82e4ccb5847 100644 --- a/drivers/md/dm-flakey.c +++ b/drivers/md/dm-flakey.c @@ -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 */