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Fri, 16 Apr 2021 00:48:57 +0000 From: quanyang.wang@windriver.com To: Mark Brown , Michal Simek , Amit Kumar Mahapatra Cc: linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Quanyang Wang Subject: [PATCH 4/5] spi: spi-zynqmp-gqspi: fix use-after-free in zynqmp_qspi_exec_op Date: Fri, 16 Apr 2021 08:46:51 +0800 Message-Id: <20210416004652.2975446-5-quanyang.wang@windriver.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210416004652.2975446-1-quanyang.wang@windriver.com> References: <20210416004652.2975446-1-quanyang.wang@windriver.com> X-Originating-IP: [60.247.85.82] X-ClientProxiedBy: SJ0PR13CA0026.namprd13.prod.outlook.com (2603:10b6:a03:2c0::31) To CY4PR11MB0071.namprd11.prod.outlook.com (2603:10b6:910:7a::30) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from pek-qwang2-d1.wrs.com (60.247.85.82) by SJ0PR13CA0026.namprd13.prod.outlook.com (2603:10b6:a03:2c0::31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4065.8 via Frontend Transport; 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This will trigger a use-after-free KASAN warning. Let's use temporary variables to store op->addr.val and op->cmd.opcode to fix this issue. Fixes: 1c26372e5aa9 ("spi: spi-zynqmp-gqspi: Update driver to use spi-mem framework") Signed-off-by: Quanyang Wang --- drivers/spi/spi-zynqmp-gqspi.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c index 2e2607b5dee9..419bc1e6358b 100644 --- a/drivers/spi/spi-zynqmp-gqspi.c +++ b/drivers/spi/spi-zynqmp-gqspi.c @@ -928,8 +928,9 @@ static int zynqmp_qspi_exec_op(struct spi_mem *mem, struct zynqmp_qspi *xqspi = spi_controller_get_devdata (mem->spi->master); int err = 0, i; - u8 *tmpbuf; u32 genfifoentry = 0; + u16 opcode = op->cmd.opcode; + u64 opaddr; dev_dbg(xqspi->dev, "cmd:%#x mode:%d.%d.%d.%d\n", op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth, @@ -942,14 +943,8 @@ static int zynqmp_qspi_exec_op(struct spi_mem *mem, genfifoentry |= xqspi->genfifobus; if (op->cmd.opcode) { - tmpbuf = kzalloc(op->cmd.nbytes, GFP_KERNEL | GFP_DMA); - if (!tmpbuf) { - mutex_unlock(&xqspi->op_lock); - return -ENOMEM; - } - tmpbuf[0] = op->cmd.opcode; reinit_completion(&xqspi->data_completion); - xqspi->txbuf = tmpbuf; + xqspi->txbuf = &opcode; xqspi->rxbuf = NULL; xqspi->bytes_to_transfer = op->cmd.nbytes; xqspi->bytes_to_receive = 0; @@ -963,13 +958,12 @@ static int zynqmp_qspi_exec_op(struct spi_mem *mem, if (!wait_for_completion_timeout (&xqspi->data_completion, msecs_to_jiffies(1000))) { err = -ETIMEDOUT; - kfree(tmpbuf); goto return_err; } - kfree(tmpbuf); } if (op->addr.nbytes) { + xqspi->txbuf = &opaddr; for (i = 0; i < op->addr.nbytes; i++) { *(((u8 *)xqspi->txbuf) + i) = op->addr.val >> (8 * (op->addr.nbytes - i - 1));