From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>,
Matthias Brugger <matthias.bgg@gmail.com>
Cc: linux-serial@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>
Subject: [PATCH] tty: serial: 8250_mtk: Fix potential NULL pointer dereference
Date: Tue, 22 Jan 2019 13:57:19 -0600 [thread overview]
Message-ID: <20190122195719.GA21846@embeddedor> (raw)
There is a potential NULL pointer dereference in case devm_kzalloc()
fails and returns NULL.
Fix this by adding a NULL check on data->dma
This bug was detected with the help of Coccinelle.
Fixes: 85b5c1dd0456 ("serial: 8250-mtk: add uart DMA support")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
drivers/tty/serial/8250/8250_mtk.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
index e2c407656fa6..c1fdbc0b6840 100644
--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -357,6 +357,9 @@ static int mtk8250_probe_of(struct platform_device *pdev, struct uart_port *p,
if (dmacnt == 2) {
data->dma = devm_kzalloc(&pdev->dev, sizeof(*data->dma),
GFP_KERNEL);
+ if (!data->dma)
+ return -ENOMEM;
+
data->dma->fn = mtk8250_dma_filter;
data->dma->rx_size = MTK_UART_RX_SIZE;
data->dma->rxconf.src_maxburst = MTK_UART_RX_TRIGGER;
--
2.20.1
reply other threads:[~2019-01-22 19:57 UTC|newest]
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