ALSA: n64: check return value after calling platform_get_resource()

[ Upstream commit be471fe332f7f14aa6828010b220d7e6902b91a0 ]

It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20210610124958.116142-1-yangyingliang@huawei.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/sound/mips/snd-n64.c b/sound/mips/snd-n64.c
index e35e93157755f0bf1e61ca4987b76f59dc8db3c6..463a6fe589eb267f06e7debd87e7ddae054ef8ae 100644 (file)
--- a/sound/mips/snd-n64.c
+++ b/sound/mips/snd-n64.c
@@ -338,6 +338,10 @@ static int __init n64audio_probe(struct platform_device *pdev)
        strcpy(card->longname, "N64 Audio");
 
        res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+       if (!res) {
+               err = -EINVAL;
+               goto fail_dma_alloc;
+       }
        if (devm_request_irq(&pdev->dev, res->start, n64audio_isr,
                                IRQF_SHARED, "N64 Audio", priv)) {
                err = -EBUSY;