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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH 3/7] dma: apbh: fix out-of-bounds write on 64-bit SoCs
Date: Mon, 28 Sep 2020 17:42:43 +0200	[thread overview]
Message-ID: <20200928154247.15619-3-a.fatoum@pengutronix.de> (raw)
In-Reply-To: <20200928154247.15619-1-a.fatoum@pengutronix.de>

i.MX8 MM & MN are both ARM64 SoCs with a device compatible
with "fsl,imx28-dma-apbh". Probing the barebox device driver on these
SoCs would invoke undefined behavior however, because of an
errant cast. Fix this.

This has a side-effect: Whereas before, probing devices matched by
driver name failed with -ENODEV, they are now considered to be
compatible to IMX23_DMA instead. As we don't depend on this, this
is deemed acceptable.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 drivers/dma/apbh_dma.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/dma/apbh_dma.c b/drivers/dma/apbh_dma.c
index 3bee89f78b85..186c69388c7f 100644
--- a/drivers/dma/apbh_dma.c
+++ b/drivers/dma/apbh_dma.c
@@ -596,9 +596,7 @@ static int apbh_dma_probe(struct device_d *dev)
 	enum mxs_dma_id id;
 	int ret, channel;
 
-	ret = dev_get_drvdata(dev, (const void **)&id);
-	if (ret)
-		return ret;
+	id = (enum mxs_dma_id)device_get_match_data(dev);
 
 	apbh_dma = apbh = xzalloc(sizeof(*apbh));
 	iores = dev_request_mem_resource(dev, 0);
-- 
2.28.0


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  parent reply	other threads:[~2020-09-28 15:42 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-28 15:42 [PATCH 1/7] driver: introduce less error-prone dev_get_drvdata alternative Ahmad Fatoum
2020-09-28 15:42 ` [PATCH 2/7] led: pca955x: fix probing from device tree Ahmad Fatoum
2020-09-29  7:19   ` Sascha Hauer
2020-09-30  7:28     ` Ahmad Fatoum
2020-09-28 15:42 ` Ahmad Fatoum [this message]
2020-09-28 15:42 ` [PATCH 4/7] aiodev: lm75: fix out-of-bounds write on 64-bit SoCs Ahmad Fatoum
2020-09-28 15:42 ` [PATCH 5/7] mtd: nand-mxs: " Ahmad Fatoum
2020-09-28 16:01   ` Marco Felsch
2020-09-28 16:03     ` Ahmad Fatoum
2020-09-28 16:08       ` Marco Felsch
2020-09-28 15:42 ` [PATCH 6/7] video: imx-hdmi: fix dev_get_drvdata misuse Ahmad Fatoum
2020-09-28 15:42 ` [PATCH 7/7] driver: migrate some from dev_get_drvdata to device_get_match_data Ahmad Fatoum
2020-09-28 15:46 ` [PATCH 1/7] driver: introduce less error-prone dev_get_drvdata alternative Ahmad Fatoum
2020-09-29  6:45 ` Sascha Hauer
2020-09-29  7:32 ` Sascha Hauer
2020-09-29  9:42   ` Ahmad Fatoum
2020-09-30  7:48     ` Sascha Hauer
2020-09-30 13:13       ` Ahmad Fatoum
2020-10-05  8:31         ` Ahmad Fatoum
2020-10-07  8:43           ` Sascha Hauer

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