path: root/sound
diff options
authorWang YanQing <>2013-05-07 11:27:33 +0800
committerTakashi Iwai <>2013-05-07 07:31:59 +0200
commit2195b063f6609e4c6268f291683902f25eaf9aa6 (patch)
tree49673707b98bf6aa4dd3a150583d8137bc32568f /sound
parent5a4ca9b3fa24f81298c13a27c03c6dd4087ca159 (diff)
ALSA: HDA: Fix Oops caused by dereference NULL pointer
The interrupt handler azx_interrupt will call azx_update_rirb, which may call snd_hda_queue_unsol_event, snd_hda_queue_unsol_event will dereference chip->bus pointer. The problem is we alloc chip->bus in azx_codec_create which will be called after we enable IRQ and enable unsolicited event in azx_probe. This will cause Oops due dereference NULL pointer. I meet it, good luck:) [Rearranged the NULL check before the tracepoint and added another NULL check of bus->workq -- tiwai] Signed-off-by: Wang YanQing <> Cc: <> Signed-off-by: Takashi Iwai <>
Diffstat (limited to 'sound')
1 files changed, 3 insertions, 0 deletions
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 6f9b64700f6..86674f67abd 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -681,6 +681,9 @@ int snd_hda_queue_unsol_event(struct hda_bus *bus, u32 res, u32 res_ex)
struct hda_bus_unsolicited *unsol;
unsigned int wp;
+ if (!bus || !bus->workq)
+ return 0;
trace_hda_unsol_event(bus, res, res_ex);
unsol = bus->unsol;
if (!unsol)