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clk: meson-axg: fix potential NULL dereference in axg_clkc_probe() 

platform_get_resource() may return NULL, add proper
check to avoid potential NULL dereferencing.

This is detected by Coccinelle semantic patch.

@@
expression pdev, res, n, t, e, e1, e2;
@@

res = platform_get_resource(pdev, t, n);
+ if (!res)
+   return -EINVAL;
... when != res == NULL
e = devm_ioremap(e1, res->start, e2);

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
weiyongjun (A) 2018-01-05 01:50:59 +00:00 committed by Stephen Boyd
parent 348c898cb8
commit 9d548d8038
1 changed files with 2 additions and 0 deletions
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2
drivers/clk/meson/axg.c
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@ -879,6 +879,8 @@ static int axg_clkc_probe(struct platform_device *pdev)
/* Generic clocks and PLLs */ /* Generic clocks and PLLs */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
clk_base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); clk_base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (!clk_base) { if (!clk_base) {
dev_err(&pdev->dev, "Unable to map clk base\n"); dev_err(&pdev->dev, "Unable to map clk base\n");