From: Navid Emamdoost <navid.emamdoost@gmail.com>
To: unlisted-recipients:; (no To-header on input)
Cc: emamd001@umn.edu, kjlu@umn.edu, smccaman@umn.edu,
Navid Emamdoost <navid.emamdoost@gmail.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Vinod Koul <vkoul@kernel.org>,
linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] 8250_lpss: check null return when calling pci_ioremap_bar
Date: Thu, 18 Jul 2019 21:54:42 -0500 [thread overview]
Message-ID: <20190719025443.2368-1-navid.emamdoost@gmail.com> (raw)
pci_ioremap_bar may return null. This is eventually de-referenced at
drivers/dma/dw/core.c:1154 and drivers/dma/dw/core.c:1168. A null check is
needed to prevent null de-reference. I am adding the check and in case of
failure returning -ENOMEM (I am not sure this is the best errno, you may
consider it as a placeholder), and subsequently changing the caller’s
return type, and propagating the error.
Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
---
drivers/tty/serial/8250/8250_lpss.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_lpss.c b/drivers/tty/serial/8250/8250_lpss.c
index 53ca9ba6ab4b..5954b2e09b76 100644
--- a/drivers/tty/serial/8250/8250_lpss.c
+++ b/drivers/tty/serial/8250/8250_lpss.c
@@ -161,7 +161,7 @@ static const struct dw_dma_platform_data qrk_serial_dma_pdata = {
.multi_block = {0},
};
-static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port)
+static int qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port)
{
struct uart_8250_dma *dma = &lpss->dma;
struct dw_dma_chip *chip = &lpss->dma_chip;
@@ -172,12 +172,14 @@ static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port)
chip->dev = &pdev->dev;
chip->irq = pci_irq_vector(pdev, 0);
chip->regs = pci_ioremap_bar(pdev, 1);
+ if (!chip->regs)
+ return -ENOMEM;
chip->pdata = &qrk_serial_dma_pdata;
/* Falling back to PIO mode if DMA probing fails */
ret = dw_dma_probe(chip);
if (ret)
- return;
+ return 0;
pci_try_set_mwi(pdev);
@@ -191,6 +193,7 @@ static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port)
param->hs_polarity = true;
lpss->dma_maxburst = 8;
+ return 0;
}
static void qrk_serial_exit_dma(struct lpss8250 *lpss)
@@ -219,7 +222,9 @@ static int qrk_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
port->irq = pci_irq_vector(pdev, 0);
- qrk_serial_setup_dma(lpss, port);
+ ret = qrk_serial_setup_dma(lpss, port);
+ if (ret < 0)
+ return ret;
return 0;
}
--
2.17.1
next reply other threads:[~2019-07-19 2:55 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-19 2:54 Navid Emamdoost [this message]
2019-07-19 13:37 ` [PATCH] 8250_lpss: check null return when calling pci_ioremap_bar Andy Shevchenko
2019-07-19 15:15 ` Andy Shevchenko
2019-07-19 17:48 ` [PATCH v2] " Navid Emamdoost
2019-07-19 22:36 ` Andy Shevchenko
[not found] ` <CGME20190726113223eucas1p287f8f2df03f66658bd492c592fd426e6@eucas1p2.samsung.com>
2019-07-26 11:32 ` Bartlomiej Zolnierkiewicz
2019-07-26 11:57 ` Andy Shevchenko
2019-07-26 19:53 ` [PATCH v3] " Navid Emamdoost
[not found] ` <CAEkB2ERhxLj7ogoy1E3j8d4MyEZqroWS1tPRxyJXR2oLhNz+LQ@mail.gmail.com>
2019-09-07 15:53 ` Andy Shevchenko
[not found] ` <CAEkB2ET-SQFiBbroxDFEVrPxto6a2wLJf0NM7R=ERcPargr66Q@mail.gmail.com>
2019-09-07 16:16 ` Andy Shevchenko
2019-07-19 13:58 ` [PATCH] " kbuild test robot
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