From: Alasdair G Kergon <agk@redhat.com>
Date: Mon, 25 Jul 2011 00:50:00 +0000 (+1000)
Subject: Detect invalid empty messages in core dm instead of requiring every target to
X-Git-Tag: next-20110726~30^2~3
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=352c210f3f78b197b89d5261bd86cf49d7656b7d;p=karo-tx-linux.git

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

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

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 03f8af5d244a..2e9a3ca37bdd 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1424,6 +1424,11 @@ 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;