[merged mm-nonmm-stable] squashfs-reject-negative-file-sizes-in-squashfs_read_inode.patch removed from -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The quilt patch titled
     Subject: Squashfs: reject negative file sizes in squashfs_read_inode()
has been removed from the -mm tree.  Its filename was
     squashfs-reject-negative-file-sizes-in-squashfs_read_inode.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: Phillip Lougher <phillip@squashfs.org.uk>
Subject: Squashfs: reject negative file sizes in squashfs_read_inode()
Date: Fri, 26 Sep 2025 22:59:35 +0100

Syskaller reports a "WARNING in ovl_copy_up_file" in overlayfs.

This warning is ultimately caused because the underlying Squashfs file
system returns a file with a negative file size.

This commit checks for a negative file size and returns EINVAL.

[phillip@squashfs.org.uk: only need to check 64 bit quantity]
  Link: https://lkml.kernel.org/r/20250926222305.110103-1-phillip@squashfs.org.uk
Link: https://lkml.kernel.org/r/20250926215935.107233-1-phillip@squashfs.org.uk
Fixes: 6545b246a2c8 ("Squashfs: inode operations")
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
Reported-by: syzbot+f754e01116421e9754b9@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/68d580e5.a00a0220.303701.0019.GAE@google.com/
Cc: Amir Goldstein <amir73il@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/squashfs/inode.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/fs/squashfs/inode.c~squashfs-reject-negative-file-sizes-in-squashfs_read_inode
+++ a/fs/squashfs/inode.c
@@ -197,6 +197,10 @@ int squashfs_read_inode(struct inode *in
 			goto failed_read;
 
 		inode->i_size = le64_to_cpu(sqsh_ino->file_size);
+		if (inode->i_size < 0) {
+			err = -EINVAL;
+			goto failed_read;
+		}
 		frag = le32_to_cpu(sqsh_ino->fragment);
 		if (frag != SQUASHFS_INVALID_FRAG) {
 			/*
_

Patches currently in -mm which might be from phillip@squashfs.org.uk are