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 B9B1022094; Tue, 22 Jul 2025 14:06:44 +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=1753193204; cv=none; b=NZC9sq7aDuwoYbHzzSdYWE4lf1sJ04SDnmw+r+c60INUynI2Y1OG23e9ihxE3hdwmfvhKTtTxG7SFxN8aYphSaVi19JEx/jQj/kHYhtyz0ygIamGcmoYub1lzDvSc+np63y80UpGFotEkyl1COfgZuBGzZgzHf8YmFMFEai4y/Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753193204; c=relaxed/simple; bh=YHvw1wAxLrV2owQRgQmv+ymkvSqsN6A+8J+Vr6zlF3w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=seSfsqsIfTGjQjcFdlfw8ivtzLeCusBf8+7+4LTc4jIOm796Emz7GMRealf7djRrE0kNWGx+yT8FvMv8CfUD+a/lso7G5MN88TNxEGRoWrsyAfoJxDU1lpIF4AsbD1tKbsWdUbnCjFCT6+FOBJfnDM1TcIJjdNVx7fgkHWZ2RxY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=S7w/BHe5; 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="S7w/BHe5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3FA5EC4CEEB; Tue, 22 Jul 2025 14:06:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1753193204; bh=YHvw1wAxLrV2owQRgQmv+ymkvSqsN6A+8J+Vr6zlF3w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S7w/BHe5w8T9X3heUFZTep2HYB0+oE11QknGRTo7Ggao5pWQqtmgrmHGHt0jDbrsa 1rs9NglN7+IAFNJsYecWxwGgA6MpavxUrQ4hY1+bFLh0wn3yWQI9GBsV/zJMpyh873 GaXb/uA0MBD5ER/zAIz+3O6tORpSu0S/Z42dPGVk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Cheng Ming Lin , Mark Brown Subject: [PATCH 6.15 022/187] spi: Add check for 8-bit transfer with 8 IO mode support Date: Tue, 22 Jul 2025 15:43:12 +0200 Message-ID: <20250722134346.585996259@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250722134345.761035548@linuxfoundation.org> References: <20250722134345.761035548@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 6.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Cheng Ming Lin commit 710505212e3272396394f8cf78e3ddfd05df3f22 upstream. The current SPI framework does not verify if the SPI device supports 8 IO mode when doing an 8-bit transfer. This patch adds a check to ensure that if the transfer tx_nbits or rx_nbits is 8, the SPI mode must support 8 IO. If not, an error is returned, preventing undefined behavior. Fixes: d6a711a898672 ("spi: Fix OCTAL mode support") Cc: stable@vger.kernel.org Signed-off-by: Cheng Ming Lin Link: https://patch.msgid.link/20250714031023.504752-1-linchengming884@gmail.com Signed-off-by: Mark Brown Signed-off-by: Greg Kroah-Hartman --- drivers/spi/spi.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -4133,10 +4133,13 @@ static int __spi_validate(struct spi_dev xfer->tx_nbits != SPI_NBITS_OCTAL) return -EINVAL; if ((xfer->tx_nbits == SPI_NBITS_DUAL) && - !(spi->mode & (SPI_TX_DUAL | SPI_TX_QUAD))) + !(spi->mode & (SPI_TX_DUAL | SPI_TX_QUAD | SPI_TX_OCTAL))) return -EINVAL; if ((xfer->tx_nbits == SPI_NBITS_QUAD) && - !(spi->mode & SPI_TX_QUAD)) + !(spi->mode & (SPI_TX_QUAD | SPI_TX_OCTAL))) + return -EINVAL; + if ((xfer->tx_nbits == SPI_NBITS_OCTAL) && + !(spi->mode & SPI_TX_OCTAL)) return -EINVAL; } /* Check transfer rx_nbits */ @@ -4149,10 +4152,13 @@ static int __spi_validate(struct spi_dev xfer->rx_nbits != SPI_NBITS_OCTAL) return -EINVAL; if ((xfer->rx_nbits == SPI_NBITS_DUAL) && - !(spi->mode & (SPI_RX_DUAL | SPI_RX_QUAD))) + !(spi->mode & (SPI_RX_DUAL | SPI_RX_QUAD | SPI_RX_OCTAL))) return -EINVAL; if ((xfer->rx_nbits == SPI_NBITS_QUAD) && - !(spi->mode & SPI_RX_QUAD)) + !(spi->mode & (SPI_RX_QUAD | SPI_RX_OCTAL))) + return -EINVAL; + if ((xfer->rx_nbits == SPI_NBITS_OCTAL) && + !(spi->mode & SPI_RX_OCTAL)) return -EINVAL; }