dm ioctl: prevent empty message



Detect invalid empty messages in core dm instead of requiring every target to
check this.

Signed-off-by: Alasdair G Kergon <agk@redhat.com>

parent 13c87583

drivers/md/dm-ioctl.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -1402,6 +1402,11 @@ static int target_message(struct dm_ioctl *param, size_t param_size)
		goto out;
		}

		if (!argc) {
		DMWARN("Empty message received.");
		goto out;
		}

		table = dm_get_live_table(md);
		if (!table)
		goto out_argv;