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dm ioctl: prevent empty message
author
Alasdair G Kergon
<agk@redhat.com>
Tue, 2 Aug 2011 11:32:03 +0000
(12:32 +0100)
committer
Alasdair G Kergon
<agk@redhat.com>
Tue, 2 Aug 2011 11:32:03 +0000
(12:32 +0100)
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
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diff --git
a/drivers/md/dm-ioctl.c
b/drivers/md/dm-ioctl.c
index 4cacdad2270a345e1ef8455eddf5c2a2838a22e1..1622a6bc0bfd08752252df0e3c6ccb4c76cab70d 100644
(file)
--- 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;