[alsa-devel] [PATCH] sound: 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 --- 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 aa2a83eb81a9..dc27a480c2d9 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],