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