3 files changed, 11 insertions, 7 deletions
diff --git a/fs/cifs/fs_context.c b/fs/cifs/fs_context.c
index 6d13f8207e96..ace11a1a7c8a 100644
--- a/fs/cifs/fs_context.c
+++ b/fs/cifs/fs_context.c
@@ -441,13 +441,14 @@ out:
  * but there are some bugs that prevent rename from working if there are
  * multiple delimiters.
  *
- * Returns a sanitized duplicate of @path. The caller is responsible for
- * cleaning up the original.
+ * Returns a sanitized duplicate of @path. @gfp indicates the GFP_* flags
+ * for kstrdup.
+ * The caller is responsible for freeing the original.
  */
 #define IS_DELIM(c) ((c) == '/' || (c) == '\\')
-static char *sanitize_path(char *path)
+char *cifs_sanitize_prepath(char *prepath, gfp_t gfp)
 {
-	char *cursor1 = path, *cursor2 = path;
+	char *cursor1 = prepath, *cursor2 = prepath;
 
 	/* skip all prepended delimiters */
 	while (IS_DELIM(*cursor1))
@@ -469,7 +470,7 @@ static char *sanitize_path(char *path)
 		cursor2--;
 
 	*(cursor2) = '\0';
-	return kstrdup(path, GFP_KERNEL);
+	return kstrdup(prepath, gfp);
 }
 
 /*
@@ -531,7 +532,7 @@ smb3_parse_devname(const char *devname, struct smb3_fs_context *ctx)
 	if (!*pos)
 		return 0;
 
-	ctx->prepath = sanitize_path(pos);
+	ctx->prepath = cifs_sanitize_prepath(pos, GFP_KERNEL);
 	if (!ctx->prepath)
 		return -ENOMEM;
 
diff --git a/fs/cifs/fs_context.h b/fs/cifs/fs_context.h
index 3de00e7127ec..f4eaf8558902 100644
--- a/fs/cifs/fs_context.h
+++ b/fs/cifs/fs_context.h
@@ -287,4 +287,7 @@ extern void smb3_update_mnt_flags(struct cifs_sb_info *cifs_sb);
  */
 #define SMB3_MAX_DCLOSETIMEO (1 << 30)
 #define SMB3_DEF_DCLOSETIMEO (1 * HZ) /* even 1 sec enough to help eg open/write/close/open/read */
+
+extern char *cifs_sanitize_prepath(char *prepath, gfp_t gfp);
+
 #endif
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index b44fb51968bf..7f085ed2d866 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -1195,7 +1195,7 @@ int cifs_update_super_prepath(struct cifs_sb_info *cifs_sb, char *prefix)
 	kfree(cifs_sb->prepath);
 
 	if (prefix && *prefix) {
-		cifs_sb->prepath = kstrdup(prefix, GFP_ATOMIC);
+		cifs_sb->prepath = cifs_sanitize_prepath(prefix, GFP_ATOMIC);
 		if (!cifs_sb->prepath)
 			return -ENOMEM;