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ALSA: 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@umn.edu>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Kangjie Lu 2019-03-14 22:58:29 -05:00 committed by Takashi Iwai
parent da484d00f0
commit 6ade657d61
1 changed files with 5 additions and 0 deletions
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5
sound/pci/echoaudio/echoaudio.c
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@ -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)) {