linux-kernel - [PATCH 3.12 010/142] mtd: pmcmsp: use kstrndup instead of kmalloc+strncpy

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Message-Id: <94f8c5b094186a9cd890416b880fe53adba2c452.1491838390.git.jslaby@suse.cz>
Date:   Mon, 10 Apr 2017 17:31:31 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Brian Norris <computersforpeace@...il.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 010/142] mtd: pmcmsp: use kstrndup instead of kmalloc+strncpy

From: Arnd Bergmann <arnd@...db.de>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 906b268477bc03daaa04f739844c120fe4dbc991 upstream.

kernelci.org reports a warning for this driver, as it copies a local
variable into a 'const char *' string:

    drivers/mtd/maps/pmcmsp-flash.c:149:30: warning: passing argument 1 of 'strncpy' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]

Using kstrndup() simplifies the code and avoids the warning.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Marek Vasut <marek.vasut@...il.com>
Signed-off-by: Brian Norris <computersforpeace@...il.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/mtd/maps/pmcmsp-flash.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/mtd/maps/pmcmsp-flash.c b/drivers/mtd/maps/pmcmsp-flash.c
index f9fa3fad728e..2051f28ddac6 100644
--- a/drivers/mtd/maps/pmcmsp-flash.c
+++ b/drivers/mtd/maps/pmcmsp-flash.c
@@ -139,15 +139,13 @@ static int __init init_msp_flash(void)
 		}
 
 		msp_maps[i].bankwidth = 1;
-		msp_maps[i].name = kmalloc(7, GFP_KERNEL);
+		msp_maps[i].name = kstrndup(flash_name, 7, GFP_KERNEL);
 		if (!msp_maps[i].name) {
 			iounmap(msp_maps[i].virt);
 			kfree(msp_parts[i]);
 			goto cleanup_loop;
 		}
 
-		msp_maps[i].name = strncpy(msp_maps[i].name, flash_name, 7);
-
 		for (j = 0; j < pcnt; j++) {
 			part_name[5] = '0' + i;
 			part_name[7] = '0' + j;
-- 
2.12.2