releases/4.14.113/alsa-sb8-add-a-check-for-request_region.patch

   1 From 682f852a5e86fe259240deeca5c0499fa2f31178 Mon Sep 17 00:00:00 2001
   2 From: Kangjie Lu <kjlu@umn.edu>
   3 Date: Thu, 14 Mar 2019 23:04:14 -0500
   4 Subject: ALSA: sb8: add a check for request_region
   5
   6 [ Upstream commit dcd0feac9bab901d5739de51b3f69840851f8919 ]
   7
   8 In case request_region fails, the fix returns an error code to
   9 avoid NULL pointer dereference.
  10
  11 Signed-off-by: Kangjie Lu <kjlu@umn.edu>
  12 Signed-off-by: Takashi Iwai <tiwai@suse.de>
  13 Signed-off-by: Sasha Levin <sashal@kernel.org>
  14 ---
  15  sound/isa/sb/sb8.c | 4 ++++
  16  1 file changed, 4 insertions(+)
  17
  18 diff --git a/sound/isa/sb/sb8.c b/sound/isa/sb/sb8.c
  19 index d77dcba276b5..1eb8b61a185b 100644
  20 --- a/sound/isa/sb/sb8.c
  21 +++ b/sound/isa/sb/sb8.c
  22 @@ -111,6 +111,10 @@ static int snd_sb8_probe(struct device *pdev, unsigned int dev)
  23
  24         /* block the 0x388 port to avoid PnP conflicts */
  25         acard->fm_res = request_region(0x388, 4, "SoundBlaster FM");
  26 +       if (!acard->fm_res) {
  27 +               err = -EBUSY;
  28 +               goto _err;
  29 +       }
  30
  31         if (port[dev] != SNDRV_AUTO_PORT) {
  32                 if ((err = snd_sbdsp_create(card, port[dev], irq[dev],
  33 --
  34 2.19.1
  35