Vorbis dev - Feb 2015 - [PATCH] oggenc: Fix crash by invalid channels in WAV files

Fix the crash of oggenc when parsing a WAV file including zero or a
negative number of channels.

Fixes for both CVE-2014-9638 and CVE-2014-9639

---
 oggenc/audio.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/oggenc/audio.c
+++ b/oggenc/audio.c
@@ -455,6 +455,12 @@ int wav_open(FILE *in, oe_enc_opt *opt,
     format.align =       READ_U16_LE(buf+12);
     format.samplesize =  READ_U16_LE(buf+14);
 
+    if(format.channels <= 0)
+    {
+      fprintf(stderr,"ERROR: Invalid number of channels (%d) found in WAV
file\n", format.channels);
+      return 0;
+    }
+
     if(format.format == -2) /* WAVE_FORMAT_EXTENSIBLE */
     {
       if(len<40)