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
WARNING: multiple messages have this Message-ID (diff)
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: "Gustavo A. R. Silva" <gustavo@embeddedor.com>, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2019-01-22 19:57 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-01-22 19:57 Gustavo A. R. Silva [this message] 2019-01-22 19:57 ` [PATCH] tty: serial: 8250_mtk: Fix potential NULL pointer dereference Gustavo A. R. Silva
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