| From | Paul Gortmaker <> | Subject | [v2.6.34-stable 44/77] ALSA: hda/realtek - Fix Oops in alc_mux_select() | Date | Tue, 8 Jan 2013 18:35:23 -0500 |
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From: Takashi Iwai <tiwai@suse.de>
------------------- This is a commit scheduled for the next v2.6.34 longterm release. http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git If you see a problem with using this for longterm, please comment. -------------------
commit cce4aa378a049f4275416ee6302dd24f37b289df upstream.
When no imux is available (e.g. a single capture source), alc_auto_init_input_src() may trigger an Oops due to the access to -1. Add a proper zero-check to avoid it.
Signed-off-by: Takashi Iwai <tiwai@suse.de> [PG: in mainline, 21268961d3 rewrites and creates alc_mux_select, but the code that needed the check still existed prior to that in alc_mux_enum_put] Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> --- sound/pci/hda/patch_realtek.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c index 94f1a80..28118fd 100644 --- a/sound/pci/hda/patch_realtek.c +++ b/sound/pci/hda/patch_realtek.c @@ -444,6 +444,8 @@ static int alc_mux_enum_put(struct snd_kcontrol *kcontrol, imux = &spec->input_mux[mux_idx]; if (!imux->num_items && mux_idx > 0) imux = &spec->input_mux[0]; + if (!imux->num_items) + return 0; type = get_wcaps_type(get_wcaps(codec, nid)); if (type == AC_WID_AUD_MIX) { -- 1.7.12.1
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