releases/4.4.170/alsa-cs46xx-potential-null-dereference-in-probe.patch

   1 From 1524f4e47f90b27a3ac84efbdd94c63172246a6f Mon Sep 17 00:00:00 2001
   2 From: Dan Carpenter <dan.carpenter@oracle.com>
   3 Date: Tue, 8 Jan 2019 10:43:30 +0300
   4 Subject: ALSA: cs46xx: Potential NULL dereference in probe
   5
   6 From: Dan Carpenter <dan.carpenter@oracle.com>
   7
   8 commit 1524f4e47f90b27a3ac84efbdd94c63172246a6f upstream.
   9
  10 The "chip->dsp_spos_instance" can be NULL on some of the ealier error
  11 paths in snd_cs46xx_create().
  12
  13 Reported-by: "Yavuz, Tuba" <tuba@ece.ufl.edu>
  14 Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
  15 Cc: <stable@vger.kernel.org>
  16 Signed-off-by: Takashi Iwai <tiwai@suse.de>
  17 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  18
  19 ---
  20  sound/pci/cs46xx/dsp_spos.c |    3 +++
  21  1 file changed, 3 insertions(+)
  22
  23 --- a/sound/pci/cs46xx/dsp_spos.c
  24 +++ b/sound/pci/cs46xx/dsp_spos.c
  25 @@ -899,6 +899,9 @@ int cs46xx_dsp_proc_done (struct snd_cs4
  26         struct dsp_spos_instance * ins = chip->dsp_spos_instance;
  27         int i;
  28
  29 +       if (!ins)
  30 +               return 0;
  31 +
  32         snd_info_free_entry(ins->proc_sym_info_entry);
  33         ins->proc_sym_info_entry = NULL;
  34