This is a note to let you know that I've just added the patch titled
fs/ntfs3: Fix null-ptr-deref on inode->i_op in ntfs_lookup()
to the 6.1-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:
fs-ntfs3-fix-null-ptr-deref-on-inode-i_op-in-ntfs_lookup.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 254e69f284d7270e0abdc023ee53b71401c3ba0c Mon Sep 17 00:00:00 2001
From: ZhangPeng <zhangpeng362@xxxxxxxxxx>
Date: Fri, 25 Nov 2022 10:21:59 +0000
Subject: fs/ntfs3: Fix null-ptr-deref on inode->i_op in ntfs_lookup()
From: ZhangPeng <zhangpeng362@xxxxxxxxxx>
commit 254e69f284d7270e0abdc023ee53b71401c3ba0c upstream.
Syzbot reported a null-ptr-deref bug:
ntfs3: loop0: Different NTFS' sector size (1024) and media sector size
(512)
ntfs3: loop0: Mark volume as dirty due to NTFS errors
general protection fault, probably for non-canonical address
0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
RIP: 0010:d_flags_for_inode fs/dcache.c:1980 [inline]
RIP: 0010:__d_add+0x5ce/0x800 fs/dcache.c:2796
Call Trace:
<TASK>
d_splice_alias+0x122/0x3b0 fs/dcache.c:3191
lookup_open fs/namei.c:3391 [inline]
open_last_lookups fs/namei.c:3481 [inline]
path_openat+0x10e6/0x2df0 fs/namei.c:3688
do_filp_open+0x264/0x4f0 fs/namei.c:3718
do_sys_openat2+0x124/0x4e0 fs/open.c:1310
do_sys_open fs/open.c:1326 [inline]
__do_sys_open fs/open.c:1334 [inline]
__se_sys_open fs/open.c:1330 [inline]
__x64_sys_open+0x221/0x270 fs/open.c:1330
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
If the MFT record of ntfs inode is not a base record, inode->i_op can be
NULL. And a null-ptr-deref may happen:
ntfs_lookup()
dir_search_u() # inode->i_op is set to NULL
d_splice_alias()
__d_add()
d_flags_for_inode() # inode->i_op->get_link null-ptr-deref
Fix this by adding a Check on inode->i_op before calling the
d_splice_alias() function.
Fixes: 4342306f0f0d ("fs/ntfs3: Add file operations and implementation")
Reported-by: syzbot+a8f26a403c169b7593fe@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: ZhangPeng <zhangpeng362@xxxxxxxxxx>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@xxxxxxxxxxxxxxxxxxxx>
Cc: Rudi Heitbaum <rudi@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ntfs3/namei.c | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/fs/ntfs3/namei.c
+++ b/fs/ntfs3/namei.c
@@ -96,6 +96,16 @@ static struct dentry *ntfs_lookup(struct
inode = ERR_PTR(-EINVAL);
}
+ /*
+ * Check for a null pointer
+ * If the MFT record of ntfs inode is not a base record, inode->i_op can be NULL.
+ * This causes null pointer dereference in d_splice_alias().
+ */
+ if (!IS_ERR(inode) && inode->i_op == NULL) {
+ iput(inode);
+ inode = ERR_PTR(-EINVAL);
+ }
+
return d_splice_alias(inode, dentry);
}
Patches currently in stable-queue which might be from zhangpeng362@xxxxxxxxxx are
queue-6.1/fs-ntfs3-fix-null-ptr-deref-on-inode-i_op-in-ntfs_lookup.patch
queue-6.1/fs-ntfs3-fix-null-ptr-deref-on-inode-i_op-in-ntfs_lo.patch
