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audio/pcmconv: check number of input channels

--- a/sys/src/cmd/audio/pcmconv/pcmconv.c

+++ b/sys/src/cmd/audio/pcmconv/pcmconv.c

@@ -421,6 +421,9 @@

 		exits(0);

 	}

+	if(i.channels > nelem(ch))

+		sysfatal("too many input channels %d", i.channels);

+

 	switch(i.fmt){

 	case 's': iconv = siconv; break;

 	case 'u': iconv = uiconv; break;

@@ -444,7 +447,7 @@

 	obuf = sbrk(o.framesz * m);

 	memset(ch, 0, sizeof(ch));

-	for(k=0; k < i.channels && k < nelem(ch); k++)

+	for(k=0; k < i.channels; k++)

 		chaninit(&ch[k], i.rate, o.rate, n);

 	for(;;){

@@ -451,7 +454,7 @@

 		if(l >= 0 && l < r)

 			r = l;

 		n = cread(0, ibuf, r, i.framesz);

-		if(n < 0 || n > sizeof(ibuf))

+		if(n < 0)

 			sysfatal("read: %r");

 		if(l > 0)

 			l -= n;

-- 

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