Commit 9cbb3261 authored by Gustavo A. R. Silva's avatar Gustavo A. R. Silva Committed by Greg Kroah-Hartman

mailbox: xgene-slimpro: Fix potential NULL pointer dereference

commit 3512a18c upstream.

There is a potential execution path in which function
platform_get_resource() returns NULL. If this happens,
we will end up having a NULL pointer dereference.

Fix this by replacing devm_ioremap with devm_ioremap_resource,
which has the NULL check and the memory region request.

This code was detected with the help of Coccinelle.

Cc: stable@vger.kernel.org
Fixes: f700e84f ("mailbox: Add support for APM X-Gene platform mailbox driver")
Signed-off-by: default avatarGustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: default avatarJassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c160382a
......@@ -195,9 +195,9 @@ static int slimpro_mbox_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, ctx);
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
mb_base = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
if (!mb_base)
return -ENOMEM;
mb_base = devm_ioremap_resource(&pdev->dev, regs);
if (IS_ERR(mb_base))
return PTR_ERR(mb_base);
/* Setup mailbox links */
for (i = 0; i < MBOX_CNT; i++) {
......
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