From: "Paulo Alcantara (SUSE)" <pc@cjr.nz>
Date: Wed, 4 Dec 2019 17:38:01 -0300
Subject: [PATCH] cifs: Merge is_path_valid() into get_normalized_path()
Git-commit: ff2f7fc08268f266372c30a815349749e8499eb5
References: bsc#1144333
Patch-mainline: v5.6-rc1

Just do the trivial path validation in get_normalized_path().

Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Acked-by: Paulo Alcantara <palcantara@suse.de>
---
 fs/cifs/dfs_cache.c | 21 ++++-----------------
 1 file changed, 4 insertions(+), 17 deletions(-)

diff --git a/fs/cifs/dfs_cache.c b/fs/cifs/dfs_cache.c
index e889608e5e13..1d1f7c03931b 100644
--- a/fs/cifs/dfs_cache.c
+++ b/fs/cifs/dfs_cache.c
@@ -75,13 +75,11 @@ static void refresh_cache_worker(struct work_struct *work);
 
 static DECLARE_DELAYED_WORK(refresh_task, refresh_cache_worker);
 
-static inline bool is_path_valid(const char *path)
+static int get_normalized_path(const char *path, char **npath)
 {
-	return path && (strchr(path + 1, '\\') || strchr(path + 1, '/'));
-}
+	if (!path || strlen(path) < 3 || (*path != '\\' && *path != '/'))
+		return -EINVAL;
 
-static inline int get_normalized_path(const char *path, char **npath)
-{
 	if (*path == '\\') {
 		*npath = (char *)path;
 	} else {
@@ -828,9 +826,6 @@ int dfs_cache_find(const unsigned int xid, struct cifs_ses *ses,
 	char *npath;
 	struct cache_entry *ce;
 
-	if (unlikely(!is_path_valid(path)))
-		return -EINVAL;
-
 	rc = get_normalized_path(path, &npath);
 	if (rc)
 		return rc;
@@ -875,9 +870,6 @@ int dfs_cache_noreq_find(const char *path, struct dfs_info3_param *ref,
 	char *npath;
 	struct cache_entry *ce;
 
-	if (unlikely(!is_path_valid(path)))
-		return -EINVAL;
-
 	rc = get_normalized_path(path, &npath);
 	if (rc)
 		return rc;
@@ -929,9 +921,6 @@ int dfs_cache_update_tgthint(const unsigned int xid, struct cifs_ses *ses,
 	struct cache_entry *ce;
 	struct cache_dfs_tgt *t;
 
-	if (unlikely(!is_path_valid(path)))
-		return -EINVAL;
-
 	rc = get_normalized_path(path, &npath);
 	if (rc)
 		return rc;
@@ -989,7 +978,7 @@ int dfs_cache_noreq_update_tgthint(const char *path,
 	struct cache_entry *ce;
 	struct cache_dfs_tgt *t;
 
-	if (unlikely(!is_path_valid(path)) || !it)
+	if (!it)
 		return -EINVAL;
 
 	rc = get_normalized_path(path, &npath);
@@ -1049,8 +1038,6 @@ int dfs_cache_get_tgt_referral(const char *path,
 
 	if (!it || !ref)
 		return -EINVAL;
-	if (unlikely(!is_path_valid(path)))
-		return -EINVAL;
 
 	rc = get_normalized_path(path, &npath);
 	if (rc)
-- 
2.25.1