From: Arun Easi aeasi@marvell.com
[ Upstream commit 47aeee5549cf9326656a8f9190960dfd35c101e2 ]
Driver was attempting to print cdb[0], which is not set for resets coming from SCSI ioctls. Check for cmd_len before accessing cmnd.
Crash info: [84790.864747] BUG: unable to handle kernel NULL pointer dereference at (null) [84790.864783] IP: qedf_initiate_tmf+0x7a/0x6e0 [qedf] [84790.865204] Call Trace: [84790.865246] scsi_try_target_reset+0x2b/0x90 [scsi_mod] [84790.865266] scsi_ioctl_reset+0x20f/0x2a0 [scsi_mod] [84790.865284] scsi_ioctl+0x131/0x3a0 [scsi_mod]
Signed-off-by: Arun Easi aeasi@marvell.com Signed-off-by: Saurav Kashyap skashyap@marvell.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/qedf/qedf_io.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/qedf/qedf_io.c b/drivers/scsi/qedf/qedf_io.c index d881e822f92cf..56756a5700867 100644 --- a/drivers/scsi/qedf/qedf_io.c +++ b/drivers/scsi/qedf/qedf_io.c @@ -2363,8 +2363,8 @@ int qedf_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
QEDF_ERR(NULL, "tm_flags 0x%x sc_cmd %p op = 0x%02x target_id = 0x%x lun=%d\n", - tm_flags, sc_cmd, sc_cmd->cmnd[0], rport->scsi_target_id, - (int)sc_cmd->device->lun); + tm_flags, sc_cmd, sc_cmd->cmd_len ? sc_cmd->cmnd[0] : 0xff, + rport->scsi_target_id, (int)sc_cmd->device->lun);
if (!rdata || !kref_get_unless_zero(&rdata->kref)) { QEDF_ERR(NULL, "stale rport\n");