linux-kernel - [PATCH v2] Staging: exfat: Avoid use of strcpy

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Date:   Wed, 11 Sep 2019 11:42:19 +0200
From:   Sandro Volery <sandro@...ery.com>
To:     valdis.kletnieks@...edu, gregkh@...uxfoundation.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Cc:     linux@...musvillemoes.dk, dan.carpenter@...cle.com
Subject: [PATCH v2] Staging: exfat: Avoid use of strcpy

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@...musvillemoes.dk>
Signed-off-by: Sandro Volery <sandro@...ery.com>
---
v2: Implement length check and return in one
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