From: Kangjie Lu <kjlu@umn.edu>
Date: Fri, 15 Mar 2019 04:04:14 +0000 (-0500)
Subject: ALSA: sb8: add a check for request_region
X-Git-Tag: v5.15~6526^2~34
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=dcd0feac9bab901d5739de51b3f69840851f8919;p=platform%2Fkernel%2Flinux-starfive.git

ALSA: sb8: add a check for request_region

In case request_region fails, the fix returns an error code to
avoid NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---

diff --git a/sound/isa/sb/sb8.c b/sound/isa/sb/sb8.c
index aa2a83e..dc27a48 100644
--- a/sound/isa/sb/sb8.c
+++ b/sound/isa/sb/sb8.c
@@ -111,6 +111,10 @@ static int snd_sb8_probe(struct device *pdev, unsigned int dev)
 
 	/* block the 0x388 port to avoid PnP conflicts */
 	acard->fm_res = request_region(0x388, 4, "SoundBlaster FM");
+	if (!acard->fm_res) {
+		err = -EBUSY;
+		goto _err;
+	}
 
 	if (port[dev] != SNDRV_AUTO_PORT) {
 		if ((err = snd_sbdsp_create(card, port[dev], irq[dev],