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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>
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@ -1402,6 +1402,11 @@ static int target_message(struct dm_ioctl *param, size_t param_size)
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goto out;
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}
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if (!argc) {
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DMWARN("Empty message received.");
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goto out;
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}
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table = dm_get_live_table(md);
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if (!table)
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goto out_argv;
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