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>
This commit is contained in:
Alasdair G Kergon 2011-08-02 12:32:03 +01:00
parent 13c87583ea
commit 2ca4c92f58

View file

@ -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;