Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.4 05/21] ALSA: sb8: add a check for request_region | Date | Fri, 29 Mar 2019 20:56:33 -0400 |
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From: Kangjie Lu <kjlu@umn.edu>
[ Upstream commit dcd0feac9bab901d5739de51b3f69840851f8919 ]
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> Signed-off-by: Sasha Levin <sashal@kernel.org> --- sound/isa/sb/sb8.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/sound/isa/sb/sb8.c b/sound/isa/sb/sb8.c index b8e2391c33ff..0c7fe1418447 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], -- 2.19.1
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