From: Richard Genoud <richard.genoud@gmail.com>
To: Kangjie Lu <kjlu@umn.edu>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>,
Nicolas Ferre <nicolas.ferre@microchip.com>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
Ludovic Desroches <ludovic.desroches@microchip.com>,
linux-serial@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] tty: atmel_serial: fix a NULL pointer dereference
Date: Fri, 15 Mar 2019 09:22:11 +0100 [thread overview]
Message-ID: <d8978a94-23fc-3610-e3da-5e1da2d86914@sorico.fr> (raw)
In-Reply-To: <20190315072709.22811-1-kjlu@umn.edu>
Le 15/03/2019 à 08:27, Kangjie Lu a écrit :
> Fixes: 34df42f59a60 ("serial: at91: add rx dma support")
The Fixes: tag should be just bellow the Signenf-off-by: tag
>
> In case dmaengine_prep_dma_cyclic fails, the fix returns a proper
> error code to avoid NULL pointer dereference.
>
> Signed-off-by: Kangjie Lu <kjlu@umn.edu>
^^^
here
>
> ---
> V2: simplified the patch as suggested by
> Richard Genoud <richard.genoud@gmail.com>
> ---
> drivers/tty/serial/atmel_serial.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
> index 05147fe24343..41b728d223d1 100644
> --- a/drivers/tty/serial/atmel_serial.c
> +++ b/drivers/tty/serial/atmel_serial.c
> @@ -1288,6 +1288,10 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
> sg_dma_len(&atmel_port->sg_rx)/2,
> DMA_DEV_TO_MEM,
> DMA_PREP_INTERRUPT);
> + if (!desc) {
> + dev_err(port->dev, "Preparing DMA cyclic failed\n");
> + goto chan_err;
> + }
> desc->callback = atmel_complete_rx_dma;
> desc->callback_param = port;
> atmel_port->desc_rx = desc;
>
Thanks !
Richard.
next prev parent reply other threads:[~2019-03-15 8:22 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-14 5:56 [PATCH] pci: pcie-rcar: fix a potential NULL pointer dereference Kangjie Lu
2019-03-14 7:30 ` Geert Uytterhoeven
2019-03-14 8:07 ` [PATCH v2] " Kangjie Lu
2019-03-14 8:10 ` Geert Uytterhoeven
2019-03-15 7:27 ` [PATCH v2] tty: atmel_serial: fix a " Kangjie Lu
2019-03-15 8:22 ` Richard Genoud [this message]
2019-03-15 17:16 ` [PATCH] " Kangjie Lu
2019-03-18 7:28 ` Richard Genoud
2019-03-15 7:29 ` [PATCH v2] pci: pcie-rcar: fix a potential " Kangjie Lu
2019-03-15 10:07 ` Ulrich Hecht
2019-03-15 11:54 ` Simon Horman
2019-03-29 16:22 ` Lorenzo Pieralisi
2019-03-14 8:25 [PATCH] tty: atmel_serial: fix a " Richard Genoud
2019-03-15 7:21 ` [PATCH v2] " Kangjie Lu
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