linux-kernel - [PATCH 5.4 4/5] cifs: Merge is_path_valid() into get_normalized

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230623213406.5596-5-risbhat@amazon.com>
Date:   Fri, 23 Jun 2023 21:34:05 +0000
From:   Rishabh Bhatnagar <risbhat@...zon.com>
To:     <gregkh@...uxfoundation.org>, <pc@....nz>
CC:     <stable@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-cifs@...r.kernel.org>, Aurelien Aptel <aaptel@...e.com>,
        Steve French <stfrench@...rosoft.com>,
        Rishabh Bhatnagar <risbhat@...zon.com>
Subject: [PATCH 5.4 4/5] cifs: Merge is_path_valid() into get_normalized_path()

From: "Paulo Alcantara (SUSE)" <pc@....nz>

commit ff2f7fc08268f266372c30a815349749e8499eb5 upstream.

Just do the trivial path validation in get_normalized_path().

Signed-off-by: Paulo Alcantara (SUSE) <pc@....nz>
Reviewed-by: Aurelien Aptel <aaptel@...e.com>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Rishabh Bhatnagar <risbhat@...zon.com>
---
 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 31b3dc09e109..1efba8ee86bf 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)
-- 
2.40.1