Instead of SIGFPE when bytespersample is zero or negative, return OV_EINVAL
Based on0002-Avoid-SIGFPE-when-bytespersample-is-zero.patch from Debian,
see , adjusted with input from Ralph
Giles.
@@ -1964,6 +1964,7 @@ long ov_read_filter(OggVorbis_File *vf,char *buffer,int length,
long samples;
if(vf->ready_state<OPENED)return(OV_EINVAL);
+ if(word<=0)return(OV_EINVAL);
while(1){
if(vf->ready_state==INITSET){
@@ -1989,6 +1990,8 @@ long ov_read_filter(OggVorbis_File *vf,char *buffer,int length,
long channels=ov_info(vf,-1)->channels;
long bytespersample=word * channels;
vorbis_fpu_control fpu;
+
+ if(channels<1||channels>255)return(OV_EINVAL);
if(samples>length/bytespersample)samples=length/bytespersample;
if(samples <= 0)
