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 BA6B723EAA7; Fri, 17 Oct 2025 15:55:46 +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=1760716546; cv=none; b=iKmqTiiMj10dZdcsm6QfGWYrJEwa1sU8E9igHY4rLNK2cCC2hVS5H2gvn9+rsh8bho94rfgx4CaA9mFKCKwop85zgtk0IFYqa9GbU/YYFw9F0MbiRcoTvl6Z/MX1wD2gWecytMBTdOjbyBsXnMi84eSiwvXxdGut54LJ3XUmFF8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760716546; c=relaxed/simple; bh=0LYGgC5Gfrl65/0BCMFy87ZFfxU+YowaCCfvii0ItVQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Eno6bkK0g0vTwoGbM/zx9GKgVfQFDaLeI1KnfnmPeMbtufM8kdC28gJh1UFKzTwoB2dGlgI2PFcqTVr84MmWLPDkTyYEXdhu0yPUHRbQ2R7NmijZlrG38XQ9s7GY/S6lpok2NgIjQDdFhorNvROKPxO/kNVhPjJQUkmFyPBmTd8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=uUtlahxw; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="uUtlahxw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 410F8C4CEE7; Fri, 17 Oct 2025 15:55:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1760716546; bh=0LYGgC5Gfrl65/0BCMFy87ZFfxU+YowaCCfvii0ItVQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uUtlahxweskBnrpyd+uioGX4UTIt6LU+qDEUGDtJgyLoIswtktwUjMF5jcGmyNVo7 KuzjZbZCAACEzQINTKm/1jVy4bo6Jp/WjydrVLNirGx/CkmBKG6EnBIqJID0pmYNyf a/fN48krjzljy3GnIs9UFVHzZ1n2zbyNDrtWkWQ8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Phillip Lougher , syzbot+f754e01116421e9754b9@syzkaller.appspotmail.com, Amir Goldstein , Andrew Morton , Sasha Levin Subject: [PATCH 5.15 229/276] Squashfs: reject negative file sizes in squashfs_read_inode() Date: Fri, 17 Oct 2025 16:55:22 +0200 Message-ID: <20251017145150.825311698@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251017145142.382145055@linuxfoundation.org> References: <20251017145142.382145055@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Phillip Lougher [ Upstream commit 9f1c14c1de1bdde395f6cc893efa4f80a2ae3b2b ] 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 Reported-by: syzbot+f754e01116421e9754b9@syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/68d580e5.a00a0220.303701.0019.GAE@google.com/ Cc: Amir Goldstein Cc: Signed-off-by: Andrew Morton Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- fs/squashfs/inode.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/fs/squashfs/inode.c +++ b/fs/squashfs/inode.c @@ -193,6 +193,10 @@ 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) { /*