Commit 7d831a05 authored by Kangjie Lu's avatar Kangjie Lu Committed by Greg Kroah-Hartman

ALSA: echoaudio: add a check for ioremap_nocache

[ Upstream commit 6ade657d ]

In case ioremap_nocache fails, the fix releases chip and returns
an error code upstream to avoid NULL pointer dereference.
Signed-off-by: default avatarKangjie Lu <kjlu@umn.edu>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent ce1bdbed
......@@ -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)) {
......
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