From 2ca4c92f58f9386e080b26f9ccd78c9ca5825a42 Mon Sep 17 00:00:00 2001 From: Alasdair G Kergon 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 --- 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 4cacdad2270a..1622a6bc0bfd 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; -- 2.30.2