Commit 508f914c authored by Roland Dreier's avatar Roland Dreier Committed by Luis Henriques

target: Don't call TFO->write_pending if data_length == 0

commit 885e7b0e upstream.

If an initiator sends a zero-length command (e.g. TEST UNIT READY) but
sets the transfer direction in the transport layer to indicate a
data-out phase, we still shouldn't try to transfer data.  At best it's
a NOP, and depending on the transport, we might crash on an
uninitialized sg list.
Reported-by: default avatarCraig Watson <craig.watson@vanguard-rugged.com>
Signed-off-by: default avatarRoland Dreier <roland@purestorage.com>
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 81f15cc0
......@@ -2295,7 +2295,7 @@ transport_generic_new_cmd(struct se_cmd *cmd)
* and let it call back once the write buffers are ready.
*/
target_add_to_state_list(cmd);
if (cmd->data_direction != DMA_TO_DEVICE) {
if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
target_execute_cmd(cmd);
return 0;
}
......
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