[PATCH 5/5] scsi: qla2xxx: Avoid possible run-time warning with long model_num

Kees Cook
2024-04-10T02:32:00Z

The prior strlcpy() replacement of strncpy() here (which was
later replaced with strscpy()) expected pinfo->model_num (and
pinfo->model_description) to be NUL-terminated, but it is possible
it was not, as the code pattern here shows vha->hw->model_number (and
vha->hw->model_desc) being exactly 1 character larger, and the replaced
strncpy() was copying only up to the size of the source character
array. Replace this with memtostr(), which is the unambiguous way to
convert a maybe not-NUL-terminated character array into a NUL-terminated
string.

Fixes: 527e9b704c3d ("scsi: qla2xxx: Use memcpy() and strlcpy() instead of strcpy() and strncpy()")
Signed-off-by: Kees Cook <keescook@chromium.org>
---
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Nilesh Javali <njavali@marvell.com>
Cc: GR-QLogic-Storage-Upstream@marvell.com
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org
---
drivers/scsi/qla2xxx/qla_mr.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_mr.c b/drivers/scsi/qla2xxx/qla_mr.c
index 083f94e43fba..82a7e21ddc83 100644
--- a/drivers/scsi/qla2xxx/qla_mr.c
+++ b/drivers/scsi/qla2xxx/qla_mr.c
@@ -1909,10 +1909,8 @@ qlafx00_fx_disc(scsi_qla_host_t *vha, fc_port_t *fcport, uint16_t fx_type)
if (fx_type == FXDISC_GET_CONFIG_INFO) {
struct config_info_data *pinfo =
(struct config_info_data *) fdisc->u.fxiocb.rsp_addr;
- strscpy(vha->hw->model_number, pinfo->model_num,
- ARRAY_SIZE(vha->hw->model_number));
- strscpy(vha->hw->model_desc, pinfo->model_description,
- ARRAY_SIZE(vha->hw->model_desc));
+ memtostr(vha->hw->model_number, pinfo->model_num);
+ memtostr(vha->hw->model_desc, pinfo->model_description);
memcpy(&vha->hw->mr.symbolic_name, pinfo->symbolic_name,
sizeof(vha->hw->mr.symbolic_name));
memcpy(&vha->hw->mr.serial_num, pinfo->serial_num,
--
2.34.1