[09/90] ALSA: hda - Return the error from get_wcaps_type() for invalid NIDs
From: Greg KH
Date: Mon Jan 23 2012 - 18:47:43 EST
3.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Takashi Iwai <tiwai@xxxxxxx>
commit 3a90274de3548ebb2aabfbf488cea8e275a73dc6 upstream.
When an invalid NID is given, get_wcaps() returns zero as the error,
but get_wcaps_type() takes it as the normal value and returns a bogus
AC_WID_AUD_OUT value. This confuses the parser.
With this patch, get_wcaps_type() returns -1 when value 0 is given,
i.e. an invalid NID is passed to get_wcaps().
Bugzilla: https://bugzilla.novell.com/show_bug.cgi?id=740118
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
sound/pci/hda/hda_local.h | 7 ++++++-
sound/pci/hda/hda_proc.c | 2 ++
2 files changed, 8 insertions(+), 1 deletion(-)
--- a/sound/pci/hda/hda_local.h
+++ b/sound/pci/hda/hda_local.h
@@ -474,7 +474,12 @@ static inline u32 get_wcaps(struct hda_c
}
/* get the widget type from widget capability bits */
-#define get_wcaps_type(wcaps) (((wcaps) & AC_WCAP_TYPE) >> AC_WCAP_TYPE_SHIFT)
+static inline int get_wcaps_type(unsigned int wcaps)
+{
+ if (!wcaps)
+ return -1; /* invalid type */
+ return (wcaps & AC_WCAP_TYPE) >> AC_WCAP_TYPE_SHIFT;
+}
static inline unsigned int get_wcaps_channels(u32 wcaps)
{
--- a/sound/pci/hda/hda_proc.c
+++ b/sound/pci/hda/hda_proc.c
@@ -54,6 +54,8 @@ static const char *get_wid_type_name(uns
[AC_WID_BEEP] = "Beep Generator Widget",
[AC_WID_VENDOR] = "Vendor Defined Widget",
};
+ if (wid_value == -1)
+ return "UNKNOWN Widget";
wid_value &= 0xf;
if (names[wid_value])
return names[wid_value];
--
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