linux-hardening - [PATCH v2 7/7] scsi: wd33c93: replace deprecated strncpy with strscpy

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Message-ID: <20240228-strncpy-drivers-scsi-mpi3mr-mpi3mr_fw-c-v2-7-dacebd3fcfa0@google.com>
Date: Wed, 28 Feb 2024 22:59:07 +0000
From: Justin Stitt <justinstitt@...gle.com>
To: Sathya Prakash Veerichetty <sathya.prakash@...adcom.com>, Kashyap Desai <kashyap.desai@...adcom.com>, 
	Sumit Saxena <sumit.saxena@...adcom.com>, Sreekanth Reddy <sreekanth.reddy@...adcom.com>, 
	"James E.J. Bottomley" <jejb@...ux.ibm.com>, "Martin K. Petersen" <martin.petersen@...cle.com>, 
	Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>, Ariel Elior <aelior@...vell.com>, 
	Manish Chopra <manishc@...vell.com>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Saurav Kashyap <skashyap@...vell.com>, Javed Hasan <jhasan@...vell.com>, 
	GR-QLogic-Storage-Upstream@...vell.com, Nilesh Javali <njavali@...vell.com>, 
	Manish Rangankar <mrangankar@...vell.com>, Don Brace <don.brace@...rochip.com>
Cc: mpi3mr-linuxdrv.pdl@...adcom.com, linux-scsi@...r.kernel.org, 
	linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Kees Cook <keescook@...omium.org>, MPT-FusionLinux.pdl@...adcom.com, 
	netdev@...r.kernel.org, storagedev@...rochip.com, 
	Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH v2 7/7] scsi: wd33c93: replace deprecated strncpy with strscpy

@p1 is assigned to @setup_buffer and then we manually assign a NUL-byte
at the first index. This renders the following strlen() call useless.
Moreover, we don't need to reassign p1 to setup_buffer for any reason --
neither do we need to manually set a NUL-byte at the end. strscpy()
resolves all this code making it easier to read.

Even considering the path where @str is falsey, the manual NUL-byte
assignment is useless as setup_buffer is declared with static storage
duration in the top-level scope which should NUL-initialize the whole
buffer.

Signed-off-by: Justin Stitt <justinstitt@...gle.com>
---
 drivers/scsi/wd33c93.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/scsi/wd33c93.c b/drivers/scsi/wd33c93.c
index e4fafc77bd20..a44b60c9004a 100644
--- a/drivers/scsi/wd33c93.c
+++ b/drivers/scsi/wd33c93.c
@@ -1721,9 +1721,7 @@ wd33c93_setup(char *str)
 	p1 = setup_buffer;
 	*p1 = '\0';
 	if (str)
-		strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer));
-	setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0';
-	p1 = setup_buffer;
+		strscpy(p1, str, SETUP_BUFFER_SIZE);
 	i = 0;
 	while (*p1 && (i < MAX_SETUP_ARGS)) {
 		p2 = strchr(p1, ',');

-- 
2.44.0.rc1.240.g4c46232300-goog