diff mbox series

[04/12] blk-cgroup: use correct format characters

Message ID 20220609221702.347522-5-morbo@google.com
State New
Headers show
Series Clang -Wformat warning fixes | expand

Commit Message

Bill Wendling June 9, 2022, 10:16 p.m. UTC 
From: Bill Wendling <isanbard@gmail.com>

When compiling with -Wformat, clang emits the following warnings:

mm/backing-dev.c:880:57: error: format string is not a string literal (potentially insecure) [-Werror,-Wformat-security]
        dev = device_create(bdi_class, NULL, MKDEV(0, 0), bdi, bdi->dev_name);
                                                               ^~~~~~~~~~~~~

Use a string literal for the format string.

Link: https://github.com/ClangBuiltLinux/linux/issues/378
Signed-off-by: Bill Wendling <isanbard@gmail.com>
---
 mm/backing-dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Christoph Hellwig June 10, 2022, 8:10 a.m. UTC | #1 
On Thu, Jun 09, 2022 at 10:16:23PM +0000, Bill Wendling wrote:
>  	vsnprintf(bdi->dev_name, sizeof(bdi->dev_name), fmt, args);
> -	dev = device_create(bdi_class, NULL, MKDEV(0, 0), bdi, bdi->dev_name);
> +	dev = device_create(bdi_class, NULL, MKDEV(0, 0), bdi, "%s", bdi->dev_name);

Please avoid the overly long line.  But given that bdi names aren't user
input this warning seems to shoot from the hip a bit.
diff mbox series

Patch

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index ff60bd7d74e0..7b7786dceff3 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -877,7 +877,7 @@  int bdi_register_va(struct backing_dev_info *bdi, const char *fmt, va_list args)
 		return 0;
 
 	vsnprintf(bdi->dev_name, sizeof(bdi->dev_name), fmt, args);
-	dev = device_create(bdi_class, NULL, MKDEV(0, 0), bdi, bdi->dev_name);
+	dev = device_create(bdi_class, NULL, MKDEV(0, 0), bdi, "%s", bdi->dev_name);
 	if (IS_ERR(dev))
 		return PTR_ERR(dev);