diff options
Diffstat (limited to 'drivers/target')
| -rw-r--r-- | drivers/target/loopback/tcm_loop.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c index 70c2e7f..4b5421b 100644 --- a/drivers/target/loopback/tcm_loop.c +++ b/drivers/target/loopback/tcm_loop.c @@ -127,6 +127,24 @@ static struct se_cmd *tcm_loop_allocate_core_cmd( set_host_byte(sc, DID_NO_CONNECT); return NULL; } + /* + * Because some userspace code via scsi-generic do not memset their + * associated read buffers, go ahead and do that here for type + * SCF_SCSI_CONTROL_SG_IO_CDB. Also note that this is currently + * guaranteed to be a single SGL for SCF_SCSI_CONTROL_SG_IO_CDB + * by target core in transport_generic_allocate_tasks() -> + * transport_generic_cmd_sequencer(). + */ + if (se_cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB && + se_cmd->data_direction == DMA_FROM_DEVICE) { + struct scatterlist *sg = scsi_sglist(sc); + unsigned char *buf = kmap(sg_page(sg)) + sg->offset; + + if (buf != NULL) { + memset(buf, 0, sg->length); + kunmap(sg_page(sg)); + } + } transport_device_setup_cmd(se_cmd); return se_cmd; |