static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                        AVPacket *avpkt)
{
    SCPRContext *s = avctx->priv_data;
    GetByteContext *gb = &s->gb;
    AVFrame *frame = data;
    int ret, type;

    if (avctx->bits_per_coded_sample == 16) {
        if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
            return ret;
    }

    if ((ret = ff_reget_buffer(avctx, s->current_frame)) < 0)
        return ret;

    bytestream2_init(gb, avpkt->data, avpkt->size);

    type = bytestream2_peek_byte(gb);

    if (type == 2) {
        s->get_freq = get_freq0;
        s->decode = decode0;
        frame->key_frame = 1;
        ret = decompress_i(avctx, (uint32_t *)s->current_frame->data[0],
                           s->current_frame->linesize[0] / 4);
    } else if (type == 18) {
        s->get_freq = get_freq;
        s->decode = decode;
        frame->key_frame = 1;
        ret = decompress_i(avctx, (uint32_t *)s->current_frame->data[0],
                           s->current_frame->linesize[0] / 4);
    } else if (type == 17) {
        uint32_t clr, *dst = (uint32_t *)s->current_frame->data[0];
        int x, y;

        frame->key_frame = 1;
        bytestream2_skip(gb, 1);
        if (avctx->bits_per_coded_sample == 16) {
            uint16_t value = bytestream2_get_le16(gb);
            int r, g, b;

            r = (value      ) & 31;
            g = (value >>  5) & 31;
            b = (value >> 10) & 31;
            clr = (r << 16) + (g << 8) + b;
        } else {
            clr = bytestream2_get_le24(gb);
        }
        for (y = 0; y < avctx->height; y++) {
            for (x = 0; x < avctx->width; x++) {
                dst[x] = clr;
            }
            dst += s->current_frame->linesize[0] / 4;
        }
    } else if (type == 0 || type == 1) {
        frame->key_frame = 0;

        ret = av_frame_copy(s->current_frame, s->last_frame);
        if (ret < 0)
            return ret;

        ret = decompress_p(avctx, (uint32_t *)s->current_frame->data[0],
                           s->current_frame->linesize[0] / 4,
                           (uint32_t *)s->last_frame->data[0],
                           s->last_frame->linesize[0] / 4);
    } else {
        return AVERROR_PATCHWELCOME;
    }

    if (ret < 0)
        return ret;

    if (avctx->bits_per_coded_sample != 16) {
        ret = av_frame_ref(data, s->current_frame);
        if (ret < 0)
            return ret;
    } else {
        uint8_t *dst = frame->data[0];
        int x, y;

        ret = av_frame_copy(frame, s->current_frame);
        if (ret < 0)
            return ret;

        for (y = 0; y < avctx->height; y++) {
            for (x = 0; x < avctx->width * 4; x++) {
                dst[x] = dst[x] << 3;
            }
            dst += frame->linesize[0];
        }
    }

    frame->pict_type = frame->key_frame ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;

    FFSWAP(AVFrame *, s->current_frame, s->last_frame);

    frame->data[0]     += frame->linesize[0] * (avctx->height - 1);
    frame->linesize[0] *= -1;

    *got_frame = 1;

    return avpkt->size;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.