From: ZhangPeng zhangpeng362@huawei.com
[ Upstream commit 254e69f284d7270e0abdc023ee53b71401c3ba0c ]
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@syzkaller.appspotmail.com Signed-off-by: ZhangPeng zhangpeng362@huawei.com Signed-off-by: Konstantin Komarov almaz.alexandrovich@paragon-software.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/ntfs3/namei.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/fs/ntfs3/namei.c b/fs/ntfs3/namei.c index c8db35e2ae172..3db34d5c03dc7 100644 --- a/fs/ntfs3/namei.c +++ b/fs/ntfs3/namei.c @@ -88,6 +88,16 @@ static struct dentry *ntfs_lookup(struct inode *dir, struct dentry *dentry, __putname(uni); }
+ /* + * 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); }