This is a note to let you know that I've just added the patch titled
cifs: use the correct max-length for dentry_path_raw()
to the 5.13-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-use-the-correct-max-length-for-dentry_path_raw.patch
and it can be found in the queue-5.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 981567bd965329df7e64b13e92a54da816c1e0a4 Mon Sep 17 00:00:00 2001
From: Ronnie Sahlberg <lsahlber@xxxxxxxxxx>
Date: Tue, 10 Aug 2021 16:33:55 +1000
Subject: cifs: use the correct max-length for dentry_path_raw()
From: Ronnie Sahlberg <lsahlber@xxxxxxxxxx>
commit 981567bd965329df7e64b13e92a54da816c1e0a4 upstream.
RHBZ: 1972502
PATH_MAX is 4096 but PAGE_SIZE can be >4096 on some architectures
such as ppc and would thus write beyond the end of the actual object.
Cc: <stable@xxxxxxxxxxxxxxx>
Reported-by: Xiaoli Feng <xifeng@xxxxxxxxxx>
Suggested-by: Brian foster <bfoster@xxxxxxxxxx>
Reviewed-by: Paulo Alcantara (SUSE) <pc@xxxxxx>
Signed-off-by: Ronnie Sahlberg <lsahlber@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/cifs/dir.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -112,7 +112,7 @@ build_path_from_dentry_optional_prefix(s
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;
- s = dentry_path_raw(direntry, page, PAGE_SIZE);
+ s = dentry_path_raw(direntry, page, PATH_MAX);
if (IS_ERR(s))
return s;
if (!s[1]) // for root we want "", not "/"
Patches currently in stable-queue which might be from lsahlber@xxxxxxxxxx are
queue-5.13/cifs-use-the-correct-max-length-for-dentry_path_raw.patch
