The quilt patch titled Subject: squashfs: squashfs_read_data need to check if the length is 0 has been removed from the -mm tree. Its filename was squashfs-squashfs_read_data-need-to-check-if-the-length-is-0.patch This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Lizhi Xu <lizhi.xu@xxxxxxxxxxxxx> Subject: squashfs: squashfs_read_data need to check if the length is 0 Date: Thu, 16 Nov 2023 11:13:52 +0800 When the length passed in is 0, the pagemap_scan_test_walk() caller should bail. This error causes at least a WARN_ON(). Link: https://lkml.kernel.org/r/20231116031352.40853-1-lizhi.xu@xxxxxxxxxxxxx Reported-by: syzbot+32d3767580a1ea339a81@xxxxxxxxxxxxxxxxxxxxxxxxx Closes: https://lkml.kernel.org/r/0000000000000526f2060a30a085@xxxxxxxxxx Signed-off-by: Lizhi Xu <lizhi.xu@xxxxxxxxxxxxx> Reviewed-by: Phillip Lougher <phillip@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/squashfs/block.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/squashfs/block.c~squashfs-squashfs_read_data-need-to-check-if-the-length-is-0 +++ a/fs/squashfs/block.c @@ -321,7 +321,7 @@ int squashfs_read_data(struct super_bloc TRACE("Block @ 0x%llx, %scompressed size %d\n", index - 2, compressed ? "" : "un", length); } - if (length < 0 || length > output->length || + if (length <= 0 || length > output->length || (index + length) > msblk->bytes_used) { res = -EIO; goto out; _ Patches currently in -mm which might be from lizhi.xu@xxxxxxxxxxxxx are