From 6ade657d6125ec3ec07f95fa51e28138aef6208f Mon Sep 17 00:00:00 2001
From: Kangjie Lu <kjlu@umn.edu>
Date: Thu, 14 Mar 2019 22:58:29 -0500
Subject: [PATCH] ALSA: echoaudio: add a check for ioremap_nocache
Git-commit: 6ade657d6125ec3ec07f95fa51e28138aef6208f
Patch-mainline: v5.1-rc2
References: bsc#1051510
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>
---
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)) {
--
2.16.4