From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794062002; b=v07A9AypR0vYGP4qgGrdNU2RK657prqNbyVYZrs2CzFXpYyCurCg3EYM42pN1GxQs3Zi tc//s3byy1Xr3OuMeZ2rXJwawE0/8gANHse/lqNjvaIzCptg1Q9BCBh1L4m3AOef8D2US CjBcIu9YYqtUuXUN+1rqjSDvjsuYrvsmODUqHN49Tgw8CAX+DwYYKQydVlUB1J+u6xIUh D+JFvn5/++jYJF/aMwpGuBTVLioPdKYc7AjBsBU8XUGRyKekzJqmuLMFYbkhlX9rVV3Ew DoBabiW1a69lmqPIl2aqmAOu+A7j3cy7zDUhljv71mu1Y9uQQy4ufa2OIfM7SLtQzWg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794062002; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=VLbAeZb/sZV9CoCETsBUa0X08WQb9upn3JhHmGxjJIQ=; b=wfcuAH/nmRp+CabVNayEaqn03kmwDoToK6BX4m/ylj5U2V2qrp32AEx0pw0++8QjTWCe WGC6G3NBjIy++0AoUIRBM48bDOVHjd1Ol0ZKBNn8f9wldz/f5uYpRAtApuw+Z+1d9y6aF ae9LFAvMQ6X885H22VUinGHr2CUSKt+u9IJWp2+G4FaYc86KpFSXELvD52DkZW4tt4qQt KQWKsbgr/kVIf+HF23eB6K8TpA649zmTR0hbETeD5Nk8OfKncctO1vGSfFRucXUIxewxv Mx+uxxkM3qQha9NYaXHV3/6FYxx+rvejGK77r12513T9i+8GgR1JVv7I+Ch+CQQwsxQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=pMk+wKAz; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 364BA606A335; Sat, 7 Nov 2026 14:33:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=pMk+wKAz Received: by smtp.kernel.org (Postfix) with ESMTPSA id D9A2B1F0089F; Sat, 7 Nov 2026 14:33:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794062002; bh=VLbAeZb/sZV9CoCETsBUa0X08WQb9upn3JhHmGxjJIQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=pMk+wKAzhpGR6QcYLHGSpcVqWoOPpzpmel3OW1nODw6FaOj+jPT/vmgLhDjAmivL2 grYiDUPnYZ1E5BKL0ibFz3vt/o6lBDIap/0OGWbBW+jDg+061BwOpOH6fBwqoRU6Fk aDLldny+DJyAbRRA0WToJy+tXZnWuYGuhdD+Ukcg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, James Hilliard , Miquel Raynal , Sasha Levin Subject: [PATCH 6.12 0954/1536] mtd: rawnand: sunxi: reject ECC maximization on small pages Date: Sat, 7 Nov 2026 08:49:30 -0500 Message-ID: <20261107135024.448229548@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261107134957.653319350@linuxfoundation.org> References: <20261107134957.653319350@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: James Hilliard [ Upstream commit a3c84084a73e170374b7dd493947efdef4ee57bc ] When nand-ecc-maximize is set, the driver selects a 1024-byte ECC step and divides the available OOB bytes by the resulting number of steps. A NAND with a smaller page therefore produces zero steps and a division by zero. The older controllers also provide a 512-byte ECC block mode, but the hardware documentation describes that as an ECC block size within NAND pages whose supported sizes start at 1024 bytes. It does not document a 512-byte NAND page mode. Reject pages smaller than 1024 bytes before deriving the step count. This prevents the division by zero at the point where the incompatible maximized geometry is selected without changing explicitly configured 512-byte ECC block handling. Fixes: 4796d8655915 ("mtd: nand: sunxi: Support ECC maximization") Cc: stable@vger.kernel.org Signed-off-by: James Hilliard Signed-off-by: Miquel Raynal Signed-off-by: Sasha Levin --- drivers/mtd/nand/raw/sunxi_nand.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/mtd/nand/raw/sunxi_nand.c b/drivers/mtd/nand/raw/sunxi_nand.c index 136d67af97178..ead73f3beea13 100644 --- a/drivers/mtd/nand/raw/sunxi_nand.c +++ b/drivers/mtd/nand/raw/sunxi_nand.c @@ -1631,6 +1631,9 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct nand_chip *nand, if (nanddev->ecc.user_conf.flags & NAND_ECC_MAXIMIZE_STRENGTH) { int bytes; + if (mtd->writesize < 1024) + return -EINVAL; + ecc->size = 1024; nsectors = mtd->writesize / ecc->size; -- 2.53.0