Patch "cifs: sanitize paths in cifs_update_super_prepath." has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    cifs: sanitize paths in cifs_update_super_prepath.

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     cifs-sanitize-paths-in-cifs_update_super_prepath.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 3d9cd1556904fa928c22ec74071c34d594c127af
Author: Thiago Rafael Becker <tbecker@xxxxxxxxxx>
Date:   Wed Apr 5 10:16:48 2023 -0300

    cifs: sanitize paths in cifs_update_super_prepath.
    
    [ Upstream commit d19342c6609b67f2ba83b9eccca2777e3687f625 ]
    
    After a server reboot, clients are failing to move files with ENOENT.
    This is caused by DFS referrals containing multiple separators, which
    the server move call doesn't recognize.
    
    v1: Initial patch.
    v2: Move prototype to header.
    
    Link: https://bugzilla.redhat.com/show_bug.cgi?id=2182472
    Fixes: a31080899d5f ("cifs: sanitize multiple delimiters in prepath")
    Actually-Fixes: 24e0a1eff9e2 ("cifs: switch to new mount api")
    Reviewed-by: Paulo Alcantara (SUSE) <pc@xxxxxxxxxxxxx>
    Signed-off-by: Thiago Rafael Becker <tbecker@xxxxxxxxxx>
    Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/cifs/fs_context.c b/fs/cifs/fs_context.c
index 85ad0c9e2f8b5..8455db6a26f5a 100644
--- a/fs/cifs/fs_context.c
+++ b/fs/cifs/fs_context.c
@@ -437,13 +437,14 @@ int smb3_parse_opt(const char *options, const char *key, char **val)
  * 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))
@@ -465,7 +466,7 @@ static char *sanitize_path(char *path)
 		cursor2--;
 
 	*(cursor2) = '\0';
-	return kstrdup(path, GFP_KERNEL);
+	return kstrdup(prepath, gfp);
 }
 
 /*
@@ -527,7 +528,7 @@ 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 ad45256cf68e2..3cf8d6235162d 100644
--- a/fs/cifs/fs_context.h
+++ b/fs/cifs/fs_context.h
@@ -283,4 +283,7 @@ 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 3a90ee314ed73..300f5f382e43f 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -1301,7 +1301,7 @@ 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;