Thread (4 messages) 4 messages, 3 authors, 2019-07-05

Re: [PATCH] dmaengine: imx-sdma: fix use-after-free on probe error path

From: Vinod Koul <vkoul@kernel.org>
Date: 2019-07-05 12:50:09
Also in: dmaengine, lkml

On 24-06-19, 10:07, Sven Van Asbroeck wrote:

Quoting orignal patch for better context:
+	if (pdata) {
+		ret = sdma_get_firmware(sdma, pdata->fw_name);
+		if (ret)
+			dev_warn(&pdev->dev, "failed to get firmware from platform data\n");
+	} else {
+		/*
+		 * Because that device tree does not encode ROM script address,
+		 * the RAM script in firmware is mandatory for device tree
+		 * probe, otherwise it fails.
+		 */
+		ret = of_property_read_string(np, "fsl,sdma-ram-script-name",
+					      &fw_name);
+		if (ret)
+			dev_warn(&pdev->dev, "failed to get firmware name\n");
+		else {
+			ret = sdma_get_firmware(sdma, fw_name);
+			if (ret)
+				dev_warn(&pdev->dev, "failed to get firmware from device tree\n");
+		}
+	}
+
On 05-07-19, 08:26, Sven Van Asbroeck wrote:
Hi Vinod,

On Fri, Jul 5, 2019 at 3:32 AM Vinod Koul [off-list ref] wrote:
quoted
quoted
+             if (ret)
+                     dev_warn(&pdev->dev, "failed to get firmware name\n");
if should have braces!
Applied after fixing braces!
checkpatch.pl output after adding braces:

WARNING: braces {} are not necessary for single statement blocks
#102: FILE: drivers/dma/imx-sdma.c:2165:
+ if (ret) {
+ dev_warn(&pdev->dev, "failed to get firmware from device tree\n");
+ }
there is an else here too!

With the patch the checkpatch warns:

CHECK: braces {} should be used on all arms of this statement
#201: FILE: drivers/dma/imx-sdma.c:2161:
+		if (ret)
[...]
+		else {
[...]


Even if the if is a single block and else being multi block, if would
need matching brances. With the change pushed:

total: 0 errors, 0 warnings, 0 checks, 60 lines checked


-- 
~Vinod

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