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ovl: Filter invalid inodes with missing lookup function 

Add a check to the ovl_dentry_weird() function to prevent the
processing of directory inodes that lack the lookup function.
This is important because such inodes can cause errors in overlayfs
when passed to the lowerstack.

Reported-by: syzbot+a8c9d476508bd14a90e5@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=a8c9d476508bd14a90e5
Suggested-by: Miklos Szeredi <miklos@szeredi.hu>
Link: https://lore.kernel.org/linux-unionfs/CAJfpegvx-oS9XGuwpJx=Xe28_jzWx5eRo1y900_ZzWY+=gGzUg@mail.gmail.com/
Signed-off-by: Vasiliy Kovalev <kovalev@altlinux.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
This commit is contained in:
Vasiliy Kovalev 2024-11-19 18:58:17 +03:00 committed by Amir Goldstein
parent d66907b51b
commit c8b359dddb
1 changed files with 3 additions and 0 deletions
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3
fs/overlayfs/util.c
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@ -202,6 +202,9 @@ void ovl_dentry_init_flags(struct dentry *dentry, struct dentry *upperdentry,
bool ovl_dentry_weird(struct dentry *dentry) bool ovl_dentry_weird(struct dentry *dentry)
{ {
if (!d_can_lookup(dentry) && !d_is_file(dentry) && !d_is_symlink(dentry))
return true;
return dentry->d_flags & (DCACHE_NEED_AUTOMOUNT | return dentry->d_flags & (DCACHE_NEED_AUTOMOUNT |
DCACHE_MANAGE_TRANSIT | DCACHE_MANAGE_TRANSIT |
DCACHE_OP_HASH | DCACHE_OP_HASH |