linux-kernel - [PATCH AUTOSEL 4.4 04/21] ALSA: echoaudio: add a check for ioremap

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Message-Id: <20190330005649.28475-4-sashal@kernel.org>
Date:   Fri, 29 Mar 2019 20:56:32 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kangjie Lu <kjlu@....edu>, Takashi Iwai <tiwai@...e.de>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.4 04/21] ALSA: echoaudio: add a check for ioremap_nocache

From: Kangjie Lu <kjlu@....edu>

[ Upstream commit 6ade657d6125ec3ec07f95fa51e28138aef6208f ]

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>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 286f5e3686a3..d73ee11a32bd 100644
--- a/sound/pci/echoaudio/echoaudio.c
+++ b/sound/pci/echoaudio/echoaudio.c
@@ -1953,6 +1953,11 @@ 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)) {
-- 
2.19.1