static int decode_wdlt(GetByteContext *gb, uint8_t *frame, int width, int height)
{
    const uint8_t *frame_end   = frame + width * height;
    uint8_t *line_ptr;
    int count, i, v, lines, segments;
    int y = 0;

    lines = bytestream2_get_le16(gb);
    if (lines > height)
        return AVERROR_INVALIDDATA;

    while (lines--) {
        if (bytestream2_get_bytes_left(gb) < 2)
            return AVERROR_INVALIDDATA;
        segments = bytestream2_get_le16u(gb);
        while ((segments & 0xC000) == 0xC000) {
            unsigned skip_lines = -(int16_t)segments;
            unsigned delta = -((int16_t)segments * width);
            if (frame_end - frame <= delta || y + lines + skip_lines > height)
                return AVERROR_INVALIDDATA;
            frame    += delta;
            y        += skip_lines;
            segments = bytestream2_get_le16(gb);
        }

        if (frame_end <= frame)
            return AVERROR_INVALIDDATA;
        if (segments & 0x8000) {
            frame[width - 1] = segments & 0xFF;
            segments = bytestream2_get_le16(gb);
        }
        line_ptr = frame;
        if (frame_end - frame < width)
            return AVERROR_INVALIDDATA;
        frame += width;
        y++;
        while (segments--) {
            if (frame - line_ptr <= bytestream2_peek_byte(gb))
                return AVERROR_INVALIDDATA;
            line_ptr += bytestream2_get_byte(gb);
            count = (int8_t)bytestream2_get_byte(gb);
            if (count >= 0) {
                if (frame - line_ptr < count * 2)
                    return AVERROR_INVALIDDATA;
                if (bytestream2_get_buffer(gb, line_ptr, count * 2) != count * 2)
                    return AVERROR_INVALIDDATA;
                line_ptr += count * 2;
            } else {
                count = -count;
                if (frame - line_ptr < count * 2)
                    return AVERROR_INVALIDDATA;
                v = bytestream2_get_le16(gb);
                for (i = 0; i < count; i++)
                    bytestream_put_le16(&line_ptr, v);
            }
        }
    }

    return 0;
}

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.