target_core_alua: check for buffer overflow
When a writing to a command-provided buffer we need to ensure that we're not writing past the end of it. At the same time we need to continue processing as typically the final data length (ie the required size of the buffer) need to be returned. Signed-off-by: NHannes Reinecke <hare@suse.de> Signed-off-by: NNicholas Bellinger <nab@linux-iscsi.org>
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