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dm ioctl: prevent empty message

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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
1 changed files with 5 additions and 0 deletions
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5
drivers/md/dm-ioctl.c
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@ -1402,6 +1402,11 @@ static int target_message(struct dm_ioctl *param, size_t param_size)
goto out; goto out;
} }
if (!argc) {
DMWARN("Empty message received.");
goto out;
}
table = dm_get_live_table(md); table = dm_get_live_table(md);
if (!table) if (!table)
goto out_argv; goto out_argv;