linux-kernel - [PATCH] sound: echoaudio: add a check for ioremap

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Date:   Thu, 14 Mar 2019 22:58:29 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH] sound: echoaudio: add a check for ioremap_nocache

In case ioremap_nocache fails, the fix releases chip and returns
an error code upstream to avoid NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 sound/pci/echoaudio/echoaudio.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sound/pci/echoaudio/echoaudio.c b/sound/pci/echoaudio/echoaudio.c
index ea876b0b02b9..dc0084dc8550 100644
--- a/sound/pci/echoaudio/echoaudio.c
+++ b/sound/pci/echoaudio/echoaudio.c
@@ -1952,6 +1952,11 @@ static int snd_echo_create(struct snd_card *card,
 	}
 	chip->dsp_registers = (volatile u32 __iomem *)
 		ioremap_nocache(chip->dsp_registers_phys, sz);
+	if (!chip->dsp_registers) {
+		dev_err(chip->card->dev, "ioremap failed\n");
+		snd_echo_free(chip);
+		return -ENOMEM;
+	}
 
 	if (request_irq(pci->irq, snd_echo_interrupt, IRQF_SHARED,
 			KBUILD_MODNAME, chip)) {
-- 
2.17.1