From 2ca4c92f58f9386e080b26f9ccd78c9ca5825a42 Mon Sep 17 00:00:00 2001
From: Alasdair G Kergon <agk@redhat.com>
Date: Tue, 2 Aug 2011 12:32:03 +0100
Subject: [PATCH] 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>
---
drivers/md/dm-ioctl.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 4cacdad2270a3..1622a6bc0bfd0 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -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;
--
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