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

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Message-Id: <20240410023155.2100422-5-keescook@chromium.org>
Date: Tue,  9 Apr 2024 19:31:54 -0700
From: Kees Cook <keescook@...omium.org>
To: "Martin K . Petersen" <martin.petersen@...cle.com>
Cc: Kees Cook <keescook@...omium.org>,
	Bart Van Assche <bvanassche@....org>,
	Nilesh Javali <njavali@...vell.com>,
	GR-QLogic-Storage-Upstream@...vell.com,
	"James E.J. Bottomley" <jejb@...ux.ibm.com>,
	linux-scsi@...r.kernel.org,
	Charles Bertsch <cbertsch@....net>,
	Justin Stitt <justinstitt@...gle.com>,
	Andy Shevchenko <andy@...nel.org>,
	Sathya Prakash <sathya.prakash@...adcom.com>,
	Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
	Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>,
	Kashyap Desai <kashyap.desai@...adcom.com>,
	Sumit Saxena <sumit.saxena@...adcom.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Himanshu Madhani <himanshu.madhani@...cle.com>,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	MPT-FusionLinux.pdl@...adcom.com,
	mpi3mr-linuxdrv.pdl@...adcom.com
Subject: [PATCH 5/5] scsi: qla2xxx: Avoid possible run-time warning with long model_num

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@...omium.org>
---
Cc: Bart Van Assche <bvanassche@....org>
Cc: Nilesh Javali <njavali@...vell.com>
Cc: GR-QLogic-Storage-Upstream@...vell.com
Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: linux-scsi@...r.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