[merged mm-nonmm-stable] ocfs2-fix-listxattr-handling-when-the-buffer-is-full.patch removed from -mm tree

[merged mm-nonmm-stable] ocfs2-fix-listxattr-handling-when-the-buffer-is-full.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: ocfs2: fix listxattr handling when the buffer is full
has been removed from the -mm tree.  Its filename was
     ocfs2-fix-listxattr-handling-when-the-buffer-is-full.patch

This patch was dropped because it was merged into the mm-nonmm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: ZhengYuan Huang <gality369@gmail.com>
Subject: ocfs2: fix listxattr handling when the buffer is full
Date: Fri, 10 Apr 2026 12:03:39 +0800

[BUG]
If an OCFS2 inode has both inline and block-based xattrs, listxattr()
can return a size larger than the caller's buffer when the inline names
consume that buffer exactly.

kernel BUG at mm/usercopy.c:102!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
RIP: 0010:usercopy_abort+0xb7/0xd0 mm/usercopy.c:102
Call Trace:
 __check_heap_object+0xe3/0x120 mm/slub.c:8243
 check_heap_object mm/usercopy.c:196 [inline]
 __check_object_size mm/usercopy.c:250 [inline]
 __check_object_size+0x5c5/0x780 mm/usercopy.c:215
 check_object_size include/linux/ucopysize.h:22 [inline]
 check_copy_size include/linux/ucopysize.h:59 [inline]
 copy_to_user include/linux/uaccess.h:219 [inline]
 listxattr+0xb0/0x170 fs/xattr.c:926
 filename_listxattr fs/xattr.c:958 [inline]
 path_listxattrat+0x137/0x320 fs/xattr.c:988
 __do_sys_listxattr fs/xattr.c:1001 [inline]
 __se_sys_listxattr fs/xattr.c:998 [inline]
 __x64_sys_listxattr+0x7f/0xd0 fs/xattr.c:998
 ...

[CAUSE]
Commit 936b8834366e ("ocfs2: Refactor xattr list and remove
ocfs2_xattr_handler().") replaced the old per-handler list accounting
with ocfs2_xattr_list_entry(), but it kept using size == 0 to detect
probe mode.

That assumption stops being true once ocfs2_listxattr() finishes the
inline-xattr pass. If the inline names fill the caller buffer exactly,
the block-xattr pass runs with a non-NULL buffer and a remaining size of
zero. ocfs2_xattr_list_entry() then skips the bounds check, keeps
counting block names, and returns a positive size larger than the
supplied buffer.

[FIX]
Detect probe mode by testing whether the destination buffer pointer is
NULL instead of whether the remaining size is zero.

That restores the pre-refactor behavior and matches the OCFS2 getxattr
helpers. Once the remaining buffer reaches zero while more names are
left, the block-xattr pass now returns -ERANGE instead of reporting a
size larger than the allocated list buffer.

Link: https://lkml.kernel.org/r/20260410040339.3837162-1-gality369@gmail.com
Fixes: 936b8834366e ("ocfs2: Refactor xattr list and remove ocfs2_xattr_handler().")
Signed-off-by: ZhengYuan Huang <gality369@gmail.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Heming Zhao <heming.zhao@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/ocfs2/xattr.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/ocfs2/xattr.c~ocfs2-fix-listxattr-handling-when-the-buffer-is-full
+++ a/fs/ocfs2/xattr.c
@@ -911,8 +911,8 @@ static int ocfs2_xattr_list_entry(struct
 	total_len = prefix_len + name_len + 1;
 	*result += total_len;
 
-	/* we are just looking for how big our buffer needs to be */
-	if (!size)
+	/* No buffer means we are only looking for the required size. */
+	if (!buffer)
 		return 0;
 
 	if (*result > size)
_

Patches currently in -mm which might be from gality369@gmail.com are