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 AA5402F291B; Tue, 12 Aug 2025 18:44:46 +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=1755024286; cv=none; b=TM+8nowu8teSgs3dFe7RFdQ0eQngjtOCSJnY8YcU8EwJEerL1aFg4Pt6hOddk+tbEpQh2GCvEQouqzy+6BBsp8U9k2dzZywZ3uMoz0w7zwrtrtG+B9vXuFM3N5Tk38Bqt4G9e4c7FfRvyqbz00y2i60uOqsDxCj+BshDRgoXJ4U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755024286; c=relaxed/simple; bh=qMZVtVyq3X/AV+eqwjZbigx9gtFQNV1A0svROlJhqrI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XmWgryYIYaY3Y2xcCGwSm4+uMwt7RxEN1KtJ4IHUbsqDCNEwMolv6DNo9QOs3bQX6NkJz/CdQ+4jEDGktXlOeJN2iHQrJVMpuhsofNENOzDxa3AROUSpjDf7ZJNB9z6/op0VxOPfsk8yZDgtOlUonGUtkk60gnvmYRP5pVzNSq4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=VAvZM4GZ; 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="VAvZM4GZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1743BC4CEF0; Tue, 12 Aug 2025 18:44:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1755024286; bh=qMZVtVyq3X/AV+eqwjZbigx9gtFQNV1A0svROlJhqrI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VAvZM4GZ1TT1sIw2IefyTCUBVUViyHVW9tC3SnmHhUaHcgJNsKaOvomZxXiHsYw1t Mp6KT+6QvoWsyCTqsZvd0LvLSXEaBwqsajneEu2QPZJAuhtxrwLthMBzO2LIx50eG+ kqtBZtewhNbeZ0lKZipAPE87K31IodHHmDtDRUG4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ivan Stepchenko , Miquel Raynal , Sasha Levin Subject: [PATCH 6.16 311/627] mtd: fix possible integer overflow in erase_xfer() Date: Tue, 12 Aug 2025 19:30:06 +0200 Message-ID: <20250812173431.135194665@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250812173419.303046420@linuxfoundation.org> References: <20250812173419.303046420@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 6.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ivan Stepchenko [ Upstream commit 9358bdb9f9f54d94ceafc650deffefd737d19fdd ] The expression '1 << EraseUnitSize' is evaluated in int, which causes a negative result when shifting by 31 - the upper bound of the valid range [10, 31], enforced by scan_header(). This leads to incorrect extension when storing the result in 'erase->len' (uint64_t), producing a large unexpected value. Found by Linux Verification Center (linuxtesting.org) with Svace. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Ivan Stepchenko Signed-off-by: Miquel Raynal Signed-off-by: Sasha Levin --- drivers/mtd/ftl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mtd/ftl.c b/drivers/mtd/ftl.c index 8c22064ead38..f2bd1984609c 100644 --- a/drivers/mtd/ftl.c +++ b/drivers/mtd/ftl.c @@ -344,7 +344,7 @@ static int erase_xfer(partition_t *part, return -ENOMEM; erase->addr = xfer->Offset; - erase->len = 1 << part->header.EraseUnitSize; + erase->len = 1ULL << part->header.EraseUnitSize; ret = mtd_erase(part->mbd.mtd, erase); if (!ret) { -- 2.39.5