There are some other checks in init_get_bits function that make the function
return AVERROR_INVALIDDATA. So it is essential to check the return value.
Line 629 in libavcodec/get_bits.h function init_get_bits_xe:
if (bit_size >= INT_MAX - FFMAX(7, AV_INPUT_BUFFER_PADDING_SIZE*8) || bit_size
< 0 || !buffer) {
bit_size = 0;
buffer = NULL;
ret = AVERROR_INVALIDDATA;
}
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