A large invalid value could cause undefined behavior when left-shifted
by 8 later in the function.
avctx->channels = AV_RB32(avctx->extradata ) + 1;
avctx->bit_rate = AV_RB32(avctx->extradata + 4) * 1000;
isampf = AV_RB32(avctx->extradata + 8);
+
+ if (isampf < 8 || isampf > 44) {
+ av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate\n");
+ return AVERROR_INVALIDDATA;
+ }
switch (isampf) {
case 44: avctx->sample_rate = 44100; break;
case 22: avctx->sample_rate = 22050; break;