From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DAB8F33CE80; Tue, 17 Feb 2026 18:54:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771354496; cv=none; b=hvQoDmxjqIxrWxi0boYB3uGDhUexstkPa+OzT8a3+4uD6V+q8VOUqI91pL6n7FaSFStt/fff+VYYHF7I/u5foHva9Ihq2CwXuXvz1JFOXFt+n1oIuCVaBQqAi1vmKVSkkDdXdE5qdERSmrSCU/cKLrmZvBFAZnmqLkLEIMJOPhI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771354496; c=relaxed/simple; bh=JJE0Hx6jzZgjhwlkZO/l08SngRVGoAnjVveZaJvLr0o=; h=Date:To:From:Subject:Message-Id; b=XIFX4WeomU9VadkpSm55yQfSag95BhIkcNsBW2Rci+zjH7CPCLP3QQ97P3otKB3K125wIlxsXOVnNG0CYFxsTKKAHt2lbL5vtITr7OSGQ2D5jyWbctUWlPbmizCLNxNXHNVA3sHbfxdAgMZKtq5CaWU9+pJrrfNDEg7PfU/aJuk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=wQTThFC6; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="wQTThFC6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 80A3FC4CEF7; Tue, 17 Feb 2026 18:54:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1771354495; bh=JJE0Hx6jzZgjhwlkZO/l08SngRVGoAnjVveZaJvLr0o=; h=Date:To:From:Subject:From; b=wQTThFC6t5mjbSe5Qz8jgxFEcU47Gh5J4QWQg72jmRKHbT09R7cP+NhSMyyjodqM5 ur7qycNBpJxc8ciavijnbS2nc474dhAOrRLLzSg/Ew4vFdgkoV055jaXssCshIEuZD AM3SPiUC1WhY+i4iakqdWxpKkviqJGJuyqjINv3Y= Date: Tue, 17 Feb 2026 10:54:54 -0800 To: mm-commits@vger.kernel.org,stable@vger.kernel.org,brauner@kernel.org,phillip@squashfs.org.uk,akpm@linux-foundation.org From: Andrew Morton Subject: + squashfs-check-metadata-block-offset-is-within-range.patch added to mm-hotfixes-unstable branch Message-Id: <20260217185455.80A3FC4CEF7@smtp.kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: Squashfs: check metadata block offset is within range has been added to the -mm mm-hotfixes-unstable branch. Its filename is squashfs-check-metadata-block-offset-is-within-range.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/squashfs-check-metadata-block-offset-is-within-range.patch This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Phillip Lougher Subject: Squashfs: check metadata block offset is within range Date: Tue, 17 Feb 2026 05:09:55 +0000 Syzkaller reports a "general protection fault in squashfs_copy_data" This is ultimately caused by a corrupted index look-up table, which produces a negative metadata block offset. This is subsequently passed to squashfs_copy_data (via squashfs_read_metadata) where the negative offset causes an out of bounds access. The fix is to check that the offset is within range in squashfs_read_metadata. This will trap this and other cases. Link: https://lkml.kernel.org/r/20260217050955.138351-1-phillip@squashfs.org.uk Fixes: f400e12656ab ("Squashfs: cache operations") Reported-by: syzbot+a9747fe1c35a5b115d3f@syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/699234e2.a70a0220.2c38d7.00e2.GAE@google.com/ Signed-off-by: Phillip Lougher Cc: Christian Brauner Cc: Signed-off-by: Andrew Morton --- fs/squashfs/cache.c | 3 +++ 1 file changed, 3 insertions(+) --- a/fs/squashfs/cache.c~squashfs-check-metadata-block-offset-is-within-range +++ a/fs/squashfs/cache.c @@ -344,6 +344,9 @@ int squashfs_read_metadata(struct super_ if (unlikely(length < 0)) return -EIO; + if (unlikely(*offset < 0 || *offset >= SQUASHFS_METADATA_SIZE)) + return -EIO; + while (length) { entry = squashfs_cache_get(sb, msblk->block_cache, *block, 0); if (entry->error) { _ Patches currently in -mm which might be from phillip@squashfs.org.uk are squashfs-check-metadata-block-offset-is-within-range.patch