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ovl: Filter invalid inodes with missing lookup function

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BugLink: https://bugs.launchpad.net/bugs/2101915

commit c8b359dddb418c60df1a69beea01d1b3322bfe83 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CVE-2024-56570
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Vasiliy Kovalev
2025-03-11 08:51:19 +09:00
committed by Stefan Bader
parent 68d9a05773
commit 4da697451b
1 changed files with 3 additions and 0 deletions
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fs/overlayfs/util.c
+3
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@@ -197,6 +197,9 @@ void ovl_dentry_init_flags(struct dentry *dentry, struct dentry *upperdentry,
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 |
DCACHE_MANAGE_TRANSIT |
DCACHE_OP_HASH |