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 C693332C92B; Fri, 17 Oct 2025 15:13:11 +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=1760713993; cv=none; b=NiYT2/ETmMaiMETECZ2/0Sf0I5MJWnBKeD84gzPrU8hgKRZcHzKz72ZOcprBVt0zoXNCeqdPvNYUn+pKvRx3Q5EOrRoUR4e+u87Xjq4T1FO7ffKKReMeD8S/VSoeNqFQ1Uq6xthg2Wrh/Y3nHHhUnjEOl+jhUx0FBaRM2HcYbZw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760713993; c=relaxed/simple; bh=shAYL50+/CDPTAWYy3jHTWWe0wzxMYxpGXY4HlWerIY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QcnEZJFnquh4OIdncK7LhfJtV8wypxp9fijp+9zRrZs+08yS0ewTLrukVX8XuxCP0pFfm0sC3EhGS1oppMckRTYak9vUt/ty5qDpYBHgpBKUdjfvEP682mDvv7bw+dvvGyv+Z/MeR06BYvVLy7aeST3XhNRBdI6gaallH4A1NbA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=vRtCCDoJ; 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="vRtCCDoJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D6634C4CEE7; Fri, 17 Oct 2025 15:13:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1760713991; bh=shAYL50+/CDPTAWYy3jHTWWe0wzxMYxpGXY4HlWerIY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vRtCCDoJXnC16KqCAmNIA4tjnQO+sNcyAdao7AXB83BjN6+vsV/bMVsxp9HA5kNQn +egbPEUQKw0qsMXHfoo2yzTZud5EZk+Jcgx+zh6/g1Ol+Yf/DNl3rL6SEodAYe1IDV fXEKVQ/e8COYE0+sPPl5tSk3uR+ZI8PRgFu3C8P0= 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 6.6 158/201] Squashfs: reject negative file sizes in squashfs_read_inode() Date: Fri, 17 Oct 2025 16:53:39 +0200 Message-ID: <20251017145140.535634484@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251017145134.710337454@linuxfoundation.org> References: <20251017145134.710337454@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-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) { /*