Re: [PATCH] ALSA: usb-audio: Check mixer unit bitmap yet more strictly

[Takashi Iwai <tiwai@suse.de>]

On Thu, 22 Aug 2019 10:31:48 +0200,
Amadeusz Sławiński wrote:
> 
> On Thu, 22 Aug 2019 09:32:03 +0200
> Takashi Iwai <tiwai@suse.de> wrote:
> 
> > The bmControls (for UAC1) or bmMixerControls (for UAC2/3) bitmap has a
> > variable size depending on both input and output pins.  Its size is to
> > fit with input * output bits.  The problem is that the input size
> > can't be determined simply from the unit descriptor itself but it
> > needs to parse the whole connected sources.  Although the
> > uac_mixer_unit_get_channels() tries to check some possible overflow of
> > this bitmap, it's incomplete due to the lack of the  evaluation of
> > input pins.
> > 
> > For covering possible overflows, this patch adds the bitmap overflow
> > check in the loop of input pins in parse_audio_mixer_unit().
> > 
> > Fixes: 0bfe5e434e66 ("ALSA: usb-audio: Check mixer unit descriptors
> > more strictly") Cc: <stable@vger.kernel.org>
> > Signed-off-by: Takashi Iwai <tiwai@suse.de>
> > ---
> >  sound/usb/mixer.c | 34 ++++++++++++++++++++++++++--------
> >  1 file changed, 26 insertions(+), 8 deletions(-)
> > 
> > diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
> > index b5927c3d5bc0..27ee68a507a2 100644
> > --- a/sound/usb/mixer.c
> > +++ b/sound/usb/mixer.c
> > @@ -739,7 +739,6 @@ static int uac_mixer_unit_get_channels(struct
> > mixer_build *state, struct uac_mixer_unit_descriptor *desc)
> >  {
> >  	int mu_channels;
> > -	void *c;
> >  
> >  	if (desc->bLength < sizeof(*desc))
> >  		return -EINVAL;
> > @@ -762,13 +761,6 @@ static int uac_mixer_unit_get_channels(struct
> > mixer_build *state, break;
> >  	}
> >  
> > -	if (!mu_channels)
> > -		return 0;
> > -
> > -	c = uac_mixer_unit_bmControls(desc, state->mixer->protocol);
> > -	if (c - (void *)desc + (mu_channels - 1) / 8 >=
> > desc->bLength)
> > -		return 0; /* no bmControls -> skip */
> > -
> >  	return mu_channels;
> >  }
> >  
> > @@ -2009,6 +2001,29 @@ static int parse_audio_feature_unit(struct
> > mixer_build *state, int unitid,
> >   * Mixer Unit
> >   */
> >  
> > +/* check whether the given in/out overflows bmMixerControls matrix */
> > +static bool mixer_bitmap_overflow(struct uac_mixer_unit_descriptor
> > *desc,
> > +				  int protocol, int num_ins, int
> > num_outs) +{
> > +	u8 *hdr = (u8 *)desc;
> > +	u8 *c = uac_mixer_unit_bmControls(desc, protocol);
> > +	size_t rest; /* remaining bytes after bmMixerControls */
> > +
> > +	switch (protocol) {
> > +	case UAC_VERSION_1:
> > +	default:
> 
> Won't this trigger implicit fall through warning?

Ah indeed, I seem to have built with a little bit older kernel.
Thanks for catching it.

The revised patch is below.


Takashi

-- 8< --
From: Takashi Iwai <tiwai@suse.de>
Subject: [PATCH v2] ALSA: usb-audio: Check mixer unit bitmap yet more strictly

The bmControls (for UAC1) or bmMixerControls (for UAC2/3) bitmap has a
variable size depending on both input and output pins.  Its size is to
fit with input * output bits.  The problem is that the input size
can't be determined simply from the unit descriptor itself but it
needs to parse the whole connected sources.  Although the
uac_mixer_unit_get_channels() tries to check some possible overflow of
this bitmap, it's incomplete due to the lack of the  evaluation of
input pins.

For covering possible overflows, this patch adds the bitmap overflow
check in the loop of input pins in parse_audio_mixer_unit().

Fixes: 0bfe5e434e66 ("ALSA: usb-audio: Check mixer unit descriptors more strictly")
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
V1->v2: Fix the missing break in mixer_bitmap_overflow().

 sound/usb/mixer.c | 36 ++++++++++++++++++++++++++++--------
 1 file changed, 28 insertions(+), 8 deletions(-)

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index b5927c3d5bc0..eceab19766db 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -739,7 +739,6 @@ static int uac_mixer_unit_get_channels(struct mixer_build *state,
 				       struct uac_mixer_unit_descriptor *desc)
 {
 	int mu_channels;
-	void *c;
 
 	if (desc->bLength < sizeof(*desc))
 		return -EINVAL;
@@ -762,13 +761,6 @@ static int uac_mixer_unit_get_channels(struct mixer_build *state,
 		break;
 	}
 
-	if (!mu_channels)
-		return 0;
-
-	c = uac_mixer_unit_bmControls(desc, state->mixer->protocol);
-	if (c - (void *)desc + (mu_channels - 1) / 8 >= desc->bLength)
-		return 0; /* no bmControls -> skip */
-
 	return mu_channels;
 }
 
@@ -2009,6 +2001,31 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid,
  * Mixer Unit
  */
 
+/* check whether the given in/out overflows bmMixerControls matrix */
+static bool mixer_bitmap_overflow(struct uac_mixer_unit_descriptor *desc,
+				  int protocol, int num_ins, int num_outs)
+{
+	u8 *hdr = (u8 *)desc;
+	u8 *c = uac_mixer_unit_bmControls(desc, protocol);
+	size_t rest; /* remaining bytes after bmMixerControls */
+
+	switch (protocol) {
+	case UAC_VERSION_1:
+	default:
+		rest = 1; /* iMixer */
+		break;
+	case UAC_VERSION_2:
+		rest = 2; /* bmControls + iMixer */
+		break;
+	case UAC_VERSION_3:
+		rest = 6; /* bmControls + wMixerDescrStr */
+		break;
+	}
+
+	/* overflow? */
+	return c + (num_ins * num_outs + 7) / 8 + rest > hdr + hdr[0];
+}
+
 /*
  * build a mixer unit control
  *
@@ -2137,6 +2154,9 @@ static int parse_audio_mixer_unit(struct mixer_build *state, int unitid,
 		if (err < 0)
 			return err;
 		num_ins += iterm.channels;
+		if (mixer_bitmap_overflow(desc, state->mixer->protocol,
+					  num_ins, num_outs))
+			break;
 		for (; ich < num_ins; ich++) {
 			int och, ich_has_controls = 0;
 
-- 
2.16.4

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