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 3615C26B96A; Tue, 8 Apr 2025 12:53:23 +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=1744116803; cv=none; b=dHPMJ6kIxnT8inVA4uD+lzwxksV93oLwJHPA42/y/aQ7+b7clumOtNEHtDi3QUSkB2Ct6q8T3pkHGlhe2NNvKCUTA3aDwiPSFsbrtaVvO5rbLpG2xZxsp/25qUZwSbpgpeWZkYotyofTnDW1SG6XM+85hvqIpVJDGn8gOH5eGo8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744116803; c=relaxed/simple; bh=WfG8DOzYKaJP2AfAzq/QBYoburwMIIrGB53ki5avYJs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gRxTjFMQrNWUGy40vgBMh1wM6MP7/MOaooTWOV5ITYx0wAuRpDAktG7rDAPEsVedJsQhZYba0Zlzzt6BRzkw0ddByOtyagmbXf9HAJw3EBH28Ngp9lJgor9Ej8I6CtTwaXp7Jo4C/aBl633+MJWBrl4zcdhRy4IboLJgIW8ZHx4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=snVXP+qP; 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="snVXP+qP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B5A40C4CEE5; Tue, 8 Apr 2025 12:53:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1744116803; bh=WfG8DOzYKaJP2AfAzq/QBYoburwMIIrGB53ki5avYJs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=snVXP+qPDWY+mgIWoFONgg3gYxed4Uzcrr0z7KUM00LMeQvD3jQcv4gkWwJfgVL2B EwrHBLhDWhcCRdfFkcTpGyBmnu9mM3dsMpyqL+3tLTzxLcO+BJcFdwWiRD4OZSDPu0 VhYn4/A6OJdCQyZ74xjEmWRap4fAKEXXbV6TQiAo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yuezhang Mo , Namjae Jeon , Sasha Levin Subject: [PATCH 6.12 275/423] exfat: add a check for invalid data size Date: Tue, 8 Apr 2025 12:50:01 +0200 Message-ID: <20250408104852.171427168@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250408104845.675475678@linuxfoundation.org> References: <20250408104845.675475678@linuxfoundation.org> User-Agent: quilt/0.68 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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yuezhang Mo [ Upstream commit 13940cef95491472760ca261b6713692ece9b946 ] Add a check for invalid data size to avoid corrupted filesystem from being further corrupted. Signed-off-by: Yuezhang Mo Signed-off-by: Namjae Jeon Signed-off-by: Sasha Levin --- fs/exfat/namei.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c index e47a5ddfc79b3..7b3951951f8af 100644 --- a/fs/exfat/namei.c +++ b/fs/exfat/namei.c @@ -639,6 +639,11 @@ static int exfat_find(struct inode *dir, struct qstr *qname, info->valid_size = le64_to_cpu(ep2->dentry.stream.valid_size); info->size = le64_to_cpu(ep2->dentry.stream.size); + if (unlikely(EXFAT_B_TO_CLU_ROUND_UP(info->size, sbi) > sbi->used_clusters)) { + exfat_fs_error(sb, "data size is invalid(%lld)", info->size); + return -EIO; + } + info->start_clu = le32_to_cpu(ep2->dentry.stream.start_clu); if (!is_valid_cluster(sbi, info->start_clu) && info->size) { exfat_warn(sb, "start_clu is invalid cluster(0x%x)", -- 2.39.5