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* [PATCH v3] Staging: exfat: Avoid use of strcpy
@ 2019-09-11 12:48 Sandro Volery
  2019-09-11 12:51 ` Dan Carpenter
  0 siblings, 1 reply; 2+ messages in thread
From: Sandro Volery @ 2019-09-11 12:48 UTC (permalink / raw)
  To: valdis.kletnieks, gregkh, devel, linux-kernel; +Cc: linux, dan.carpenter

Use strscpy instead of strcpy in exfat_core.c, and add a check
for length that will return already known FFS_INVALIDPATH.

Suggested-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Sandro Volery <sandro@volery.com>
---
v3: Fixed replacing mistake
v2: Introduced length check
v1: Original patch
 drivers/staging/exfat/exfat_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/exfat/exfat_core.c b/drivers/staging/exfat/exfat_core.c
index da8c58149c35..4c40f1352848 100644
--- a/drivers/staging/exfat/exfat_core.c
+++ b/drivers/staging/exfat/exfat_core.c
@@ -2964,7 +2964,8 @@ s32 resolve_path(struct inode *inode, char *path, struct chain_t *p_dir,
 	if (strlen(path) >= (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
 		return FFS_INVALIDPATH;
 
-	strcpy(name_buf, path);
+	if (strscpy(name_buf, path, sizeof(name_buf)) < 0)
+		return FFS_INVALIDPATH;
 
 	nls_cstring_to_uniname(sb, p_uniname, name_buf, &lossy);
 	if (lossy)
-- 
2.23.0

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^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH v3] Staging: exfat: Avoid use of strcpy
  2019-09-11 12:48 [PATCH v3] Staging: exfat: Avoid use of strcpy Sandro Volery
@ 2019-09-11 12:51 ` Dan Carpenter
  0 siblings, 0 replies; 2+ messages in thread
From: Dan Carpenter @ 2019-09-11 12:51 UTC (permalink / raw)
  To: Sandro Volery; +Cc: devel, gregkh, valdis.kletnieks, linux-kernel, linux

On Wed, Sep 11, 2019 at 02:48:12PM +0200, Sandro Volery wrote:
> Use strscpy instead of strcpy in exfat_core.c, and add a check
> for length that will return already known FFS_INVALIDPATH.
> 
> Suggested-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
> Signed-off-by: Sandro Volery <sandro@volery.com>
> ---
> v3: Fixed replacing mistake
> v2: Introduced length check
> v1: Original patch
>  drivers/staging/exfat/exfat_core.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/exfat/exfat_core.c b/drivers/staging/exfat/exfat_core.c
> index da8c58149c35..4c40f1352848 100644
> --- a/drivers/staging/exfat/exfat_core.c
> +++ b/drivers/staging/exfat/exfat_core.c
> @@ -2964,7 +2964,8 @@ s32 resolve_path(struct inode *inode, char *path, struct chain_t *p_dir,
>  	if (strlen(path) >= (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Get rid of this.

>  		return FFS_INVALIDPATH;
>  
> -	strcpy(name_buf, path);
> +	if (strscpy(name_buf, path, sizeof(name_buf)) < 0)
> +		return FFS_INVALIDPATH;

regards,
dan carpenter


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2019-09-11 12:48 [PATCH v3] Staging: exfat: Avoid use of strcpy Sandro Volery
2019-09-11 12:51 ` Dan Carpenter

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