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authorRoland Dreier <roland@purestorage.com>2014-10-14 14:16:24 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-12-06 15:05:49 -0800
commitadbde413d06062edf380d4aad15caf32492e4872 (patch)
treefcb0202c65522c0db56044991dabf88f8c1cd600 /drivers/target
parent4b5ba6a22b7a4afe1f3e57d8f462c80c77cb8599 (diff)
downloadlinux-linaro-stable-adbde413d06062edf380d4aad15caf32492e4872.tar.gz
target: Don't call TFO->write_pending if data_length == 0
commit 885e7b0e181c14e4d0ddd26c688bad2b84c1ada9 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: Craig Watson <craig.watson@vanguard-rugged.com> Signed-off-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_transport.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 12342695ed79..dcc5daa0ff1c 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2128,7 +2128,7 @@ 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;
}